Information processing apparatus, information processing method, and computer program

ABSTRACT

An information processing apparatus includes a first information processor, a plurality of second information processor, and a plurality of temperature detecting units detecting temperature in the vicinity of each of the plurality of second information processors. The first information processor includes an application program execution control unit controlling execution of an application program, a distributed processing control unit controlling distributed processing, a recording unit recording first information relating to temperature detected by the temperature detecting unit, and second information relating to the execution of the process of the second information processor, an anomaly detecting unit detecting an anomaly in the temperature detected by the temperature detecting unit, and an anomaly-time control unit controlling the distributed processing of the distributed processing control unit in response to the temperature anomaly detected by the anomaly detecting unit.

CROSS REFERENCES TO RELATED APPLICATIONS

The present application is a Divisional Application of the patentapplication Ser. No. 11/154,873, filed Jun. 17, 2005, which is based onthe priority application JP-2004-198300 filed on Jul. 5, 2004, theentire contents of which are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an information processing apparatus, aninformation processing method, and a computer program and, inparticular, to an information processing apparatus, an informationprocessing method, and a computer program appropriate for distributedprocessing performed by a plurality of processors.

2. Description of the Related Art

Distributed processing for distributing a process among a plurality ofprocessors or computers for execution currently draws attention. In afirst method, distributed processing is performed by a plurality ofcomputers connected via a communication network. In a second method,distributed processing is performed among a plurality of processorsarranged in a single computer. In a third method, the first method andthe second method are combined.

An apparatus or a processor requesting the execution of distributedprocessing transmits data and a program, required to perform distributedprocess, to another apparatus or another processor which is going toperform distributed processing. Upon receiving the data and the program,the apparatus or the processor performs the requested process, and sendsback processed data to the requesting computer or the requestingprocessor.

Upon receiving the data from the computer or the processor, therequesting computer or the requesting processor performs a predeterminedprocess or records the received data.

Japanese Unexamined Patent Application Publications Nos. 2002-342165,2002-351850, 2002-358289, 2002-366533, and 2002-366534 disclosehigh-speed computer architecture techniques that perform distributedprocessing using a uniform modular structure, a common computing module,and a uniform software cell.

With an ever-increasing clock speed and higher degree of integrationimplemented in information processing apparatuses, the use of aplurality of processors permits distributed processing to be performedwithout the need for a large-scale computer.

In the techniques stated in the above disclosure, a basic processingmodule is a processor element (PE). The PE includes a processor unit(PU), a direct-memory access controller (DMAC), and a plurality ofadditional processor units (APU), namely, a plurality of sub-processorsfor the main processor.

Known processor systems perform a variety of power control methods.Japanese Unexamined Patent Application Publication No. 9-34601 disclosesa power control method in which each processor stops and resumesoperation with a network and a system controller continuously keptrunning. Japanese Unexamined Patent Application Publication No.2002-304232 discloses another power control method in which an operatingfrequency and a power supply voltage are controlled in response toloads. Japanese Unexamined Patent Application Publication No.2001-526809 discloses yet another power control method in which a faulttolerance system blocks power to a central processing unit (CPU).Japanese Unexamined Patent Application Publication No. 2000-112559discloses a power control system in which a multiprocessor systemautomatically detects no load state to control a clock frequency.Japanese Unexamined Patent Application Publication No. 2001-145174discloses a power control method in which device cooperation iscontrolled in response to a change in environment and status.

SUMMARY OF THE INVENTION

With an ever-increasing clock speed and higher degree of integrationimplemented in information processing apparatuses, a plurality ofextremely-high speed processors are mounted on a single chip. Aplurality of processors mounted on a single chip perform respectiveindependent programs, thereby performing a process to determine asolution as a single logical function (logical thread). The amount ofheat at the location of a processor within the chip is substantiallyincreased in comparison with the conventional art. In other words, heatdensity becomes substantially higher.

Processors are subject to runaway or malfunction due to heat unless anyremedial step is applied to a temperature rise at the location ofprocessors on the chip. The conventional distributed processing systemis unable to guarantee that each processor and the surrounding areathereof on the chip stay within a normal operating temperature range.Each processor fails to perform highly reliable information processingin a device-degradation free manner.

Temperature rise on the chip is not considered in the known distributedprocessing system. No technique is available to transfer or interchangea process (thread) between a plurality of processors in response to thetemperature rise at the location of each processor. In other words, noconsideration is given to the operational status of the processors,temperature on the chip, and the layout of the processors on the chip interms of the budget of the logical thread, and the selection of theprocessor as a transfer target or an interchange target of the process(thread).

With an ever-increasing clock speed and higher degree of integrationimplemented in information processing apparatuses, power consumed forprocessing is dramatically increased. In the power control method in theknown processor system, every effort is made to reduce power consumed byprocesses other than the original process of the apparatus. In the knowninformation processing apparatus performing the distributed processing,no consideration is given to the case in which power supplied to theprocessor (or the processor group) becomes insufficient or to the casein which continuous operation is desired with the power consumption ofthe processor (or the processor group) kept to a certain level

It is thus desirable to provide an information processing apparatus thatperforms highly reliable information processing with a functionoperating as a logical thread in a device degradation free manner evenwhen any processor suffers from temperature rise or an abnormal powersupply state in the middle of distributed processing.

An information processing apparatus of an embodiment of the presentinvention includes a first information processor, a plurality of secondinformation processor, and a plurality of temperature detecting units,each temperature detecting unit for detecting temperature in thevicinity of each of the plurality of second information processor. Thefirst information processor includes an application program executioncontrol unit for controlling execution of an application program, adistributed processing control unit for controlling distributedprocessing that performs process assignment on the plurality of secondinformation processors in order to provide a function corresponding to aprocess unit, the application program execution control unit, whenexecuting an application program, forming a plurality of processes to berespectively assigned to the plurality of second information processors,into the process unit for providing the function, a recording unit forrecording first information relating to temperature detected by thetemperature detecting unit, and second information relating to theexecution of the process of the second information processor, an anomalydetecting unit for detecting an anomaly in the temperature detected bythe temperature detecting unit, and an anomaly-time control unit forcontrolling the distributed processing of the distributed processingcontrol unit in response to the temperature anomaly detected by theanomaly detecting unit. The anomaly-time control unit controls thedistributed processing control unit to update, based on the firstinformation and the second information recorded by the recording unit,the assignment of the process being executed by the second informationprocessor that is detected to be in temperature anomaly.

The anomaly-time control unit may control the distributed processingcontrol unit to update the assignment of the process so that one of thesecond information processor detected not to be in temperature anomalyis selected and so that the process being executed by the secondinformation processor detected to be in temperature anomaly isreassigned to the selected second information processor for execution.

The anomaly-time preferably control unit may select, as a processassignment target with high priority based on the first informationrecorded by the recording unit, one of the second information processorhaving a vicinity temperature which, as detected by the temperaturedetecting unit, is lower than the vicinity temperatures of the othersecond information processor.

The anomaly-time control unit may select, as a process assignment targetwith high priority based on the second information recorded by therecording unit, one of the second information processor having notstarted executing the process.

The anomaly-time control unit may control the distributed processingcontrol unit to update the process assignment so that one of the secondinformation processor detected not to be in temperature anomaly isselected, and so that the process being executed by the secondinformation processor detected to be in temperature anomaly isinterchanged with the process being executed the selected secondinformation processor in execution of the processes.

The anomaly-time control unit may select, as a process interchangetarget with high priority based on the first information recorded by therecording unit, one of the second information processor having avicinity temperature which, as detected by the temperature detectingunit, is lower than the vicinity temperatures of the other secondinformation processor.

The anomaly-time control unit may select, as a process interchangetarget with high priority based on the second information recorded bythe recording unit, one of the second information processor having notstarted executing the process.

The information processing apparatus may further include a communicationunit for communicating with another information processing apparatus.

The information processing apparatus may form a network system togetherwith at least another information processing apparatus via thecommunication unit and, if own information processing apparatusfunctions as a master apparatus, the communication unit receives thefirst information and the second information of the other informationprocessing apparatus from the other information processing apparatus.The recording unit further records the first information and the secondinformation of the other information processing apparatus, received bythe communication unit. The anomaly detecting unit further detects atemperature anomaly generated in the other information processingapparatus communicable via the communication unit, based on the firstinformation of the other information processing apparatus recorded bythe recording unit. The anomaly-time control unit controls thedistributed processing control unit to update the assignment of theprocess being executed by the second information processor detected tobe in temperature anomaly, based on the first information and the secondinformation of own information processing apparatus and the otherinformation processing apparatus, recorded by the recording unit, if theanomaly detecting unit detects the temperature anomaly. If owninformation processing apparatus functions as a slave apparatus in thenetwork system, the communication unit transmits the first informationand the second information, recorded by the recording unit, to the otherinformation processing apparatus as a master apparatus in the networksystem.

The anomaly-time control unit may generate a first signal requesting theother information processing apparatus communicable via thecommunication unit to transmit the first information and the secondinformation of the other information processing apparatus if the anomalydetecting unit detects temperature anomaly. The communication unittransmits the first signal to the other information processing apparatuswhile receiving, from the other information processing apparatus, asecond signal corresponding to the first information and the secondinformation. The anomaly-time control unit controls the distributedprocessing control unit to update the assignment of the process beingexecuted by the second information processor, detected to be intemperature anomaly, in response to the second signal received by thecommunication unit.

The anomaly-time control unit may generate a first signal requesting theother information processing apparatus communicable via thecommunication unit to execute the process being executed by the secondinformation processor detected to be in temperature anomaly if theanomaly detecting unit detects the temperature anomaly, and thecommunication unit may transmit the first signal to the otherinformation processing apparatus while receiving, from the otherinformation processing apparatus, a second signal in reply to the firstsignal. The anomaly-time control unit may control the distributedprocessing control unit to update the assignment of the process beingexecuted by the second information processor detected to be intemperature anomaly, in response to the second signal received by thecommunication unit.

The information processing apparatus may include a plurality ofinformation processing modules, each module including the firstinformation processor and the second information processor.

The information processing apparatus may further include a powermeasurement unit for measuring power consumed by the informationprocessing module including the first information processor and thesecond information processor. The recording unit may further recordinformation relating to the power consumption measured by the powermeasurement unit. The anomaly detecting unit may further detect ananomaly in the power consumption measured by the power measurement unit.The anomaly-time control unit may control the distributed processingperformed by the distributed processing control unit if the anomalydetecting unit detects one of the temperature anomaly and the powerconsumption anomaly.

In accordance with one embodiment of the present invention, aninformation processing method of an information processing apparatusincluding first information processor and a plurality of secondinformation processor, includes steps of requesting the start ofdistributed processing for providing a function corresponding to aprocess unit, the first information processor, when executing anapplication program, forming a plurality of processes to be respectivelyassigned to the plurality of second information processors, into theprocess unit for providing the function, acquiring temperatureinformation of temperature generated in the vicinity of the secondinformation processor, detecting a temperature anomaly in thetemperature information acquired in the temperature informationacquisition step, determining one of the second information processor,the vicinity temperature of which is detected to be in temperatureanomaly in the anomaly detecting step, and controlling the distributedprocessing to update the assignment of the process being executed by thesecond information processor detected to be in temperature anomaly,based on the temperature information acquired in the temperatureinformation acquisition step and the determination result provided inthe determination step.

In accordance with another embodiment of the present invention, acomputer program for causing a computer to control distributedprocessing with first information processor and a plurality of secondinformation processor, includes steps of requesting the start ofdistributed processing for providing a function corresponding to aprocess unit, the first information processor, when executing anapplication program, forming a plurality of processes to be respectivelyassigned to the plurality of second information processors, into theprocess unit for providing the function, acquiring temperatureinformation of temperature generated in the vicinity of the secondinformation processor, detecting a temperature anomaly in thetemperature information acquired in the temperature informationacquisition step, determining one of the second information processor,the vicinity temperature of which is detected to be in temperatureanomaly in the anomaly detecting step, and controlling the distributedprocessing to update the assignment of the process executed by thesecond information processor detected to be in temperature anomaly,based on the temperature information acquired in the temperatureinformation acquisition step and the determination result provided inthe determination step.

With the first information processor performing the application program,the request to start the distributed processing is issued, thetemperature information concerning temperature in the vicinity of thefirst information processor or the second information processor isacquired, and the temperature anomaly is detected. One of the firstinformation processor and the second information processors, thevicinity temperature of which is detected to be in anomaly isdetermined. Based on the temperature information and the determinationresults, the distributed processing is controlled so that the assignmentof the process being executed by the second information processor intemperature anomaly is updated.

In accordance with yet another embodiment of the present invention, aninformation processing apparatus includes a first information processor,a plurality of second information processor, a power measurement unitfor measuring power consumed by an information processing moduleincluding the first information processor and the second informationprocessor, and a communication unit for communicating with the otherinformation processing apparatus. The first information processorincludes an application program execution control unit for controllingexecution of an application program, a distributed processing controlunit for controlling distributed processing that performs processassignment on the plurality of second information processors in order toprovide a function corresponding to a process unit, the applicationprogram execution control unit, when executing the application program,forming a plurality of processes to be respectively assigned to theplurality of second information processors, into the process unit forproviding the function, a recording unit for recording first informationrelating to power measured by the power measurement unit, and secondinformation relating to the execution of the process of the secondinformation processor, an anomaly detecting unit for detecting ananomaly in the power consumption measured by the power measurement unit,and an anomaly-time control unit for controlling the distributedprocessing of the distributed processing control unit in response to thepower anomaly detected by the anomaly detecting unit. The anomaly-timecontrol unit controls the distributed processing control unit to update,based on the first information and the second information recorded bythe recording unit, the assignment of the process being executed by theplurality of second information processor contained in the informationprocessing module detected to be in power anomaly.

The information processing apparatus may form a network system togetherwith at least another information processing apparatus and if owninformation processing apparatus functions as a master apparatus, thecommunication unit receives the first information and the secondinformation of the other information processing apparatus from the otherinformation processing apparatus. The recording unit further records thefirst information and the second information of the other informationprocessing apparatus, received by the communication unit. The anomalydetecting unit further detects a power anomaly generated in the otherinformation processing apparatus communicable via the communicationunit, based on the first information of the other information processingapparatus recorded by the recording unit. The anomaly-time control unitcontrols the distributed processing control unit to update theassignment of the process being executed by the plurality of secondinformation processor contained in the information processing moduledetected to be in power anomaly, based on the first information and thesecond information of own information processing apparatus and the otherinformation processing apparatus, recorded by the recording unit, if theanomaly detecting unit detects the power anomaly. If own informationprocessing apparatus functions as a slave apparatus in the networksystem, the communication unit transmits the first information and thesecond information, recorded by the recording unit, to the otherinformation processing apparatus as a master apparatus in the networksystem.

The anomaly-time control unit may generate a first signal requesting theother information processing apparatus communicable via thecommunication unit to transmit the first information and the secondinformation of the other information processing apparatus if the anomalydetecting unit detects the power anomaly. The communication unit maytransmit the first signal to the other information processing apparatuswhile receiving, from the other information processing apparatus, asecond signal corresponding to the first information and the secondinformation. The anomaly-time control unit may control the distributedprocessing control unit to update the assignment of the process beingexecuted by the plurality of second information processor contained inthe information processing module detected to be in power anomaly, inresponse to the second signal received by the communication unit.

In the information processing apparatus, the anomaly-time control unitmay generate a first signal requesting the other information processingapparatus communicable via the communication unit to execute the processbeing executed by the second information processor detected to be inpower anomaly if the anomaly detecting unit detects the power anomaly.The communication unit may transmit the first signal to the otherinformation processing apparatus while receiving, from the otherinformation processing apparatus, a second signal in reply to the firstsignal. The anomaly-time control unit may control the distributedprocessing control unit to update the assignment of the process beingexecuted by the plurality of second information processor contained inthe information processing module detected to be in power anomaly, inresponse to the second signal received by the communication unit.

In the information processing apparatus, the anomaly-time control unitmay control the distributed processing control unit to update theprocess assignment so that one of the other image processing modulesdetected not to be in any power anomaly is selected, and so that theprocess being executed by the plurality of second information processorcontained in the information processing module detected to be in poweranomaly is performed by the plurality of second information processorcontained in the selected information processing module.

In the information processing apparatus, the anomaly-time control unitmay select, as a process assignment target with high priority, theinformation processing module consuming power which, as detected by theanomaly detecting unit, is lower than the power consumed by the otherinformation processor.

In the information processing, the anomaly-time control unit may select,as a process assignment target with higher priority, the informationprocessing module operating from an alternating current source than theinformation processing module operating from a battery power source.

In the information processing apparatus, the anomaly-time control unitmay control the distributed processing control unit to update theprocess assignment so that one of the second information processingmodules detected not to be in power anomaly is selected, and so that theprocess being executed by the plurality of second information processorin the information processing module detected to be in power anomaly isinterchanged with the process of the plurality of second informationprocessor in the selected information processing module in execution ofthe processes.

The anomaly-time control unit may select, a process interchange targetwith high priority, the information processing module consuming powerwhich, as detected by the anomaly detecting unit, is lower than thepower consumed by the other information processing module.

The anomaly-time control unit may select, as a process interchangetarget with higher priority, the information processing module operatingfrom an alternating current source than the information processingmodule operating from a battery power source.

The information processing apparatus may further include a plurality ofinformation processing modules.

In accordance with another embodiment of the present invention, aninformation processing method of an information processing apparatusincluding first information processor, a plurality of second informationprocessor, and communication unit for communicating with anotherinformation processing apparatus, includes steps of requesting the startof distributed processing for providing a function corresponding to aprocess unit, the first information processor, when executing anapplication program, forming a plurality of processes to be respectivelyassigned to the plurality of second information processors, into theprocess unit for providing the function, acquiring information relatingto power consumed by an information processing module including thefirst information processor and the second information processor,detecting an anomaly in the information relating to the powerconsumption acquired in the power information acquisition step, andcontrolling the distributed processing to update the assignment of theprocess being executed by the second information processor in theinformation processing module detected to be in power anomaly, based onthe power information acquired in the power information acquisitionstep.

In accordance with yet another embodiment of the present invention, acomputer program for causing a computer to perform distributedprocessing with first information processor, a plurality of secondinformation processor, and communication unit for communicating withanother information processing apparatus, includes steps of requestingthe start of distributed processing for providing a functioncorresponding to a process unit, the first information processor, whenexecuting an application program, forming a plurality of processes to berespectively assigned to the plurality of second information processors,into the process unit for providing the function, acquiring informationrelating to power consumed by an information processing module includingthe first information processor and the second information processor,detecting an anomaly in the information relating to the powerconsumption acquired in the power information acquisition step, andcontrolling the distributed processing to update the assignment of theprocess executed by the second information processor in the informationprocessing module detected to be in power anomaly, based on the powerinformation acquired in the power information acquisition step.

With the first information processor performing the application program,the request to start the distributed processing is issued, the powerinformation concerning power consumed by the first information processoror the second information processor is acquired, and the power anomalymay be detected. One of the first information processor and the secondinformation processors detected to be in power anomaly is determined.Based on the power information, the distributed processing is controlledso that the assignment of the process being executed by the secondinformation processor in power anomaly is updated.

In accordance with embodiments of the present invention, the distributedprocessing is performed. If the temperature information of a processoris acquired, and a temperature anomaly is detected in the temperatureinformation, the distributed processing is controlled to update theprocess assignment. The function operating as a logical thread ismaintained at normal state while device degradation is controlled.Highly reliable information processing is thus performed.

If the power information of a processor is acquired, and a power anomalyis detected in the power information, the distributed processing iscontrolled to update the process assignment. The function operating as alogical thread is maintained at normal state while device degradation iscontrolled. Highly reliable information processing is thus performed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a communication system in accordance with oneembodiment of the present invention;

FIG. 2 illustrates the structure of a power supply of an informationprocessing apparatus;

FIG. 3 illustrates a main memory of the information processingapparatus;

FIG. 4 illustrates a local storage of a sub-processor of the informationprocessing apparatus;

FIG. 5 illustrates a key management table of the information processingapparatus;

FIG. 6 illustrates the structure of a software cell of the informationprocessing apparatus;

FIG. 7 illustrates the structure of an data area of the software cellwith a direct memory access command being a status reply command;

FIG. 8 illustrates the structure of a software program stored in themain memory in an information processing controller of FIG. 1;

FIG. 9 illustrates the structure of an information processing apparatusin accordance with one embodiment of the present invention;

FIG. 10 illustrates the structure of a chip in the informationprocessing controller of FIG. 9;

FIG. 11 illustrates the structure of a software program stored in theinformation processing controller of FIG. 9;

FIG. 12 is a functional block diagram illustrating the function executedby the information processing controller of FIG. 9;

FIG. 13 illustrating a temperature management table of the informationprocessing apparatus;

FIG. 14 is a flowchart illustrating an application program executionprocess 1 of the information processing apparatus;

FIG. 15 is a flowchart illustrating a temperature information managementprocess 1;

FIG. 16 is a flowchart illustrating an anomaly-time process 1 of theinformation processing apparatus;

FIG. 17 illustrates the transfer of a process of the informationprocessing apparatus;

FIG. 18 illustrates the structure of an information processingcontroller in accordance with one embodiment of the present invention;

FIG. 19 illustrates the structure of a chip in the informationprocessing apparatus of FIG. 18;

FIG. 20 illustrates the structure of a software program stored in themain memory in the information processing controller of FIG. 18;

FIG. 21 is a functional block diagram illustrating the function theinformation processing controller of FIG. 18 executed in a firstpattern;

FIG. 22 is a flowchart illustrating a temperature information managementprocess of a master apparatus;

FIG. 23 is a flowchart illustrating an anomaly-time process 2;

FIG. 24 is a flowchart illustrating a temperature information managementprocess of a slave apparatus;

FIG. 25 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 18 in asecond pattern;

FIG. 26 illustrates a temperature information reply command;

FIG. 27 is a flowchart illustrating a temperature information managementprocess 2;

FIG. 28 is a flowchart illustrating an anomaly-time process 3;

FIG. 29 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 18 in a thirdpattern;

FIG. 30 illustrates a sub-processor program transfer request command;

FIG. 31 illustrates a sub-processor program transfer reply command;

FIG. 32 is a flowchart illustrating a temperature information managementprocess 3;

FIG. 33 is a flowchart illustrating a temperature information managementprocess 4;

FIG. 34 illustrates the structure of an information processing apparatusincluding a plurality of information processing controllers inaccordance with one embodiment of the present invention;

FIG. 35 illustrates the structure of an information processingcontroller in accordance with one embodiment of the present invention;

FIG. 36 illustrates a power measurement method of a power measurementunit;

FIG. 37 illustrate the structure of a software program stored in a mainmemory of the information processing controller of FIG. 35;

FIG. 38 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 35 in thefirst pattern;

FIG. 39 illustrates a power information reply command;

FIG. 40 illustrates power management information;

FIG. 41 is a flowchart illustrating an application program executionprocess 2;

FIG. 42 is a flowchart illustrating a power information managementprocess of a master apparatus;

FIG. 43 is a flowchart illustrating an anomaly-time process 5;

FIG. 44 is a flowchart illustrating a power information managementprocess of a slave apparatus;

FIG. 45 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 35 in thesecond pattern;

FIG. 46 is a flowchart illustrating a power information managementprocess 1;

FIG. 47 is a flowchart illustrating an anomaly-time process 6;

FIG. 48 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 35 in thethird pattern;

FIG. 49 is a flowchart illustrating a power information managementprocess 2;

FIG. 50 is a flowchart illustrating an anomaly-time process 7;

FIG. 51 illustrates the structure of an information processing apparatusincluding a plurality of information processing controllers inaccordance with one embodiment of the present invention;

FIG. 52 illustrates an information processing apparatus, connected to anetwork, including a plurality of information processing controllers inaccordance with one embodiment of the present invention;

FIG. 53 illustrates the structure of an information processingcontroller in accordance with one embodiment of the present invention;

FIG. 54 illustrates the structure of a software program stored in themain memory of the information processing controller of FIG. 53;

FIG. 55 is a functional block diagram illustrating the functionperformed by the information processing controller of FIG. 53 in thethird pattern;

FIG. 56 is a flowchart illustrating an application program executionprocess 3;

FIG. 57 is a flowchart illustrating a temperature and power informationmanagement process of the master apparatus;

FIG. 58 is a flowchart illustrating an anomaly-time process 8;

FIG. 59 is a flowchart illustrating the anomaly-time process 8; and

FIG. 60 is a flowchart illustrating a temperature and power informationmanagement process of the slave apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In accordance with one embodiment of the present invention, aninformation processing apparatus includes a first information processor(for example, a main processor 42), a plurality of second informationprocessors (for example, sub-processors 43), and a plurality oftemperature detecting units (for example, temperature detectors 121) fordetecting temperature in the vicinity of each of the plurality of secondinformation processor. The first information processor includes anapplication program execution control unit (for example, an arithmeticprocessor 161) for controlling execution of an application program, adistributed processing control unit (for example, one of a logicalthread management processor 163, a logical thread management processor217, and a logical thread management processor 457) for controllingdistributed processing that performs process assignment on the pluralityof second information processors in order to provide a functioncorresponding to a process unit, the application program executioncontrol unit, when executing an application program, forming a pluralityof processes to be respectively assigned to the plurality of secondinformation processors, into the process unit for providing thefunction, a recording unit (for example, one of a temperature managementtable 167, a temperature management table 215, a temperature managementtable 233, and a temperature and power management table 452) forrecording first information relating to temperature detected by thetemperature detecting unit, and second information relating to theexecution of the process of the second information processor, an anomalydetecting unit (for example, one of a temperature rise detector 168 andan anomaly detector 453) for detecting an anomaly in the temperaturedetected by the temperature detecting unit, and an anomaly-time controlunit (for example, one of a temperature anomaly correction controller169, a temperature anomaly correction controller 216, a temperatureanomaly correction controller 234, a temperature anomaly correctioncontroller 252, and an anomaly correction controller 455) forcontrolling the distributed processing of the distributed processingcontrol unit if the temperature anomaly is detected by the anomalydetecting unit. The anomaly-time control unit controls the distributedprocessing control unit to update, based on the first information andthe second information recorded by the recording unit, the assignment ofthe process being executed by the second information processor detectedto be in temperature anomaly.

The information processing apparatus further includes a communicationunit (for example, a communication unit 16) for communicating withanother information processing apparatus.

The information processing apparatus further includes a plurality ofinformation processing modules (such as the information processingcontroller), each module including the first information processor andthe second information processor.

The information processing apparatus further includes a powermeasurement unit (for example, a power measurement unit 321) formeasuring power consumed by the information processing module includingthe first information processor and the second information processor.The recording unit (for example, a temperature and power managementtable 452) further records the information relating to the powermeasured by the power measurement unit. The anomaly detecting unit (forexample, an anomaly detector 453) detects a power anomaly in the powerconsumption measured the power measurement unit. The anomaly-timecontrol unit (for example, the anomaly correction controller 455)controls the distributed processing of the distributed processingcontrol unit if the anomaly detecting unit detects a temperature anomalyor a power anomaly.

In accordance with one embodiment of the present invention, aninformation processing method of an information processing apparatusincluding the first information processor (for example, the mainprocessor main processor 42) and the plurality of second informationprocessors (for example, the sub-processors 43), includes steps ofrequesting the start of distributed processing for providing a functioncorresponding to a process unit, the first information processing means,when executing an application program, forming a plurality of processesto be respectively assigned to the plurality of second informationprocessing means, into the process unit for providing the function, (forexample, one of step S1 of FIG. 14 and step S451 of FIG. 56), acquiringtemperature information of temperature generated in the vicinity of thesecond information processor (for example, one of step S22 of FIG. 15,step S73 of FIG. 22, step S122 of FIG. 24, step S142 of FIG. 27, stepS212 of FIG. 32, step S473 of FIG. 57, and step S562 of FIG. 60),detecting a temperature anomaly in the temperature information acquiredin the temperature information acquisition step (for example, one ofstep S24 of FIG. 15, step S75 of FIG. 22, step S144 of FIG. 27, stepS214 of FIG. 32, and step S475 of FIG. 57), determining one of thesecond information processor, the vicinity temperature of which isdetected to be in temperature anomaly in the anomaly detecting step (forexample, step S41 of FIG. 16, step S91 of FIG. 23, step S181 of FIG. 28,step S231 of FIG. 33, and step S502 of FIG. 58), and controlling thedistributed processing to update the assignment of the process executedby the second information processor detected to be in temperatureanomaly, based on the temperature information acquired in thetemperature information acquisition step and the determination resultprovided in the determination step (for example, steps S42 through S54of FIG. 16, steps S92 through S107 of FIG. 23, steps S182 through S196of FIG. 28, steps S232 through S246 of FIG. 33, or steps S503 throughS518 of FIG. 58).

A computer program of one embodiment of the present invention alsoincludes the above-referenced steps.

In accordance with yet another embodiment of the present invention, aninformation processing apparatus includes a first information processor(for example, the main processor 42), a plurality of second informationprocessors (for example, the sub-processors 43), a power measurementunit (for example, a power measurement unit 321) for measuring powerconsumed by an information processing module (for example, aninformation processing controller) including the first informationprocessor and the second information processor, and a communication unit(for example, a communication unit 16) for communicating with the otherinformation processing apparatus. The first information processorincludes an application program execution control unit (for example, thearithmetic processor 161) for controlling execution of an applicationprogram, a distributed processing control unit (for example, one of alogical thread management processor 357, and a logical thread managementprocessor 457) for controlling distributed processing that performsprocess assignment on the plurality of second information processors inorder to provide a function corresponding to a process unit, theapplication program execution control unit, when executing theapplication program, forming a plurality of processes to be respectivelyassigned to the plurality of second information processors, into theprocess unit for providing the function, a recording unit (for example,one of a power management table 354, a power management table 373, andthe temperature and power management table 452) for recording firstinformation relating to power measured by the power measurement unit,and second information relating to the execution of the process of thesecond information processor, an anomaly detecting unit (for example,one of a power rise detector 355 and an anomaly detector 453) fordetecting an anomaly in the power consumption measured by the powermeasurement unit, and an anomaly-time control unit (for example, one ofa power anomaly correction controller 356, a power anomaly correctioncontroller 374, a power anomaly correction controller 392, and a,anomaly correction controller 455) for controlling the distributedprocessing of the distributed processing control unit in response to thepower anomaly detected by the anomaly detecting unit. The anomaly-timecontrol unit controls the distributed processing control unit to update,based on the first information and the second information recorded bythe recording unit, the assignment of the process being executed by theplurality of second information processor contained in the informationprocessing module detected to be in power anomaly if the anomalydetecting unit has detected the power anomaly.

In accordance with another embodiment of the present invention, aninformation processing method of an information processing apparatusincluding a first information processor (for example, the main processor42), a plurality of second information processors (for example, thesub-processors 43), and a communication unit for communicating withanother information processing apparatus, includes steps of requestingthe start of distributed processing for providing a functioncorresponding to a process unit, the first information processing means,when executing an application program, forming a plurality of processesto be respectively assigned to the plurality of second informationprocessing means, into the process unit for providing the function, (forexample, one of step S301 of FIG. 41, and step S451 of FIG. 56),acquiring information relating to power consumed by an informationprocessing module (for example, an information processing controller)including the first information processor and the second informationprocessor (for example, one of step S323 of FIG. 42, step S328 of FIG.44, step S402 of FIG. 46, step S462 of FIG. 49, step S473 of FIG. 57,and step S562 of FIG. 60), detecting an anomaly in the informationrelating to the power consumption acquired in the power informationacquisition step (for example, one of step S325 of FIG. 42, step S404 ofFIG. 46, step S464 of FIG. 49, and step S475 of FIG. 57), andcontrolling the distributed processing to update the assignment of theprocess being executed by the second information processor in theinformation processing module detected to be in power anomaly, based onthe power information acquired in the power information acquisition step(corresponding to process to be discussed with reference to FIGS. 43,47, and 50, or steps S520 through S530 of FIG. 59).

A computer program of one embodiment of the present invention alsoincludes the above-referenced steps.

The embodiments of the present invention are described below withreference to the drawings.

FIG. 1 illustrates a communication system in accordance with oneembodiment of the present invention. In this communication system,information processing apparatuses 1-1 through 1-n are interconnected toeach other via a network 2, such as a home network, a local area network(LAN), a wide area network (WAN), or the Internet.

In response to an execution of distributed processing by a plurality ofinformation processing apparatuses, the information processing apparatus1-1 generates a software cell containing data and a program, required toexecute the requested process, and transmits the generated software cellto one of the information processing apparatuses 1-2 through 1-n via thenetwork 2.

Upon receiving the software cell transmitted from the informationprocessing apparatus 1-1, each of the information processing apparatuses1-2 through 1-n executes the requested process. After executing therequested process, each of the information processing apparatuses 1-2through 1-n transmits data resulting from the requested process to theinformation processing apparatus 1-1. If it is not necessary todiscriminate one from another among the information processingapparatuses 1-1 through 1-n, one is simply referred to as an informationprocessing apparatus 1.

Upon receiving the data transmitted from one of the informationprocessing apparatuses 1-2 through 1-n, the information processingapparatus 1-1 executes a predetermined process in response to thereceived data, or records the received data.

The information processing apparatus 1-1 includes at least oneinformation processing controller 11, a main memory 12, a recorder 13-1,a recorder 13-2, a bus 14, an operation input unit 15, a communicationunit 16, a display 17, and a drive 18.

The information processing controller 11 executes a variety of programsstored in the main memory 12, thereby generally controlling theinformation processing apparatus 1-1. The information processingcontroller 11 generates a software cell, and supplies the communicationunit 16 with the generated software cell via the bus 14. The informationprocessing controller 11 feeds the data supplied from the communicationunit 16 to one of the recorder 13-1 and the recorder 13-2. In responseto a user command input via the operation input unit 15, the informationprocessing controller 11 acquires specified data from one of the mainmemory 12, the recorder 13-1 and the recorder 13-2, and supplies theacquired data to the communication unit 16 via the bus 14.

The information processing controller 11 is assigned an informationprocessing apparatus identification (ID) that uniquely identifies theinformation processing apparatus 1-1 over the entire network 2.

The information processing controller 11 includes a bus 41, a mainprocessor 42, and sub-processors 43-1 through 43-m, a direct memoryaccess controller (DMAC) 44, a key management table recorder 45, and adisk controller (DC) 46.

The main processor 42, the sub-processor 43-1 through the sub-processor43-m, the DMAC 44, the key management table recorder 45, and the DC 46are interconnected to each other via the bus 41. The main processor 42is assigned a main processor ID that uniquely identifies the mainprocessor 42. Similarly, the sub-processors 43-1 through 43-m areassigned respective sub-processor IDs that uniquely identify thesub-processors 43-1 through 43-m.

In order to cause the information processing apparatuses 1-2 through 1-nconnected via the network 2 to perform distributed processing, the mainprocessor 42 generates the software cell and supplies the generatedsoftware cell to the communication unit 16 via the bus 41 and the bus14. The main processor 42 can be designed to execute programs other thana managing program. In this case, the main processor 42 functions as asub-processor.

The main processor 42 causes each of the sub-processors 43-1 through43-m to execute a program independent of the other sub-processors,thereby providing a single result from a logical single function(logical thread). More specifically, the main processor 42 manages theschedule of the execution of the program by the sub-processors 43-1through 43-m and generally manages the information processing controller11 (information processing apparatus 1-1).

The main processor 42 temporarily stores, in a local storage 51-1,thereof the data and the programs loaded from the main memory 12. Themain processor 42 reads the data and the programs from the local storage51-1, and executes a variety of processes based on the read data andprograms.

Under the control of the main processor 42, the sub-processors 43-1through 43-m execute programs and process data in parallel andindependent of each other. The program to be executed by the mainprocessor 42 can be executed in cooperation with the program executed bythe sub-processors 43-1 through 43-m.

The sub-processors 43-1 through 43-m are provided with local storages51-2 through 51-(m+1), respectively. The sub-processors 43-1 through43-m temporarily store data and programs in the local storages 51-2through 51-(m+1), respectively, as necessary. The sub-processors 43-1through 43-m read data and programs from the local storages 51-2 through51-(m+1), respectively, and perform a variety of programs based on theread data and programs.

If it is not necessary to discriminate one from another from among thesub-processors 43-1 through 43-m, each sub-processor is simply referredto as a sub-processor 43. If is not necessary to discriminate one fromanother from among the local storages 51-2 through 51-(m+1), each localstorage is simply referred to as a local storage 51.

Using a main processor key, a sub-processor key, and an access key,recorded on the key management table recorder 45, the DMAC 44 managesaccessing of the main processor 42 and the sub-processor 43 to theprograms and data, stored in the main memory 12.

The key management table recorder 45 records the main processor key, thesub-processor key, and the access key. The main processor key, thesub-processor key, and the access key will be discussed in detail later.

The DC 46 manages accessing of the main processor 42 and thesub-processor 43 to each of the recorder 13-1 and the recorder 13-2.

In the above discussion, the information processing apparatus 1-1includes a single information processing controller 11. Alternatively,the information processing controller 11 can include a plurality ofinformation processing controllers 11.

The main memory 12 includes a random-access memory (RAM), for example.The main memory 12 temporarily stores data and a variety programsexecuted by the main processor 42 and the sub-processor 43.

Each of the recorder 13-1 and the recorder 13-2 includes a hard disk,for example. Each of the recorder 13-1 and the recorder 13-2 stores dataand a variety of programs executed by the main processor 42 and thesub-processor 43. Each of the recorder 13-1 and the recorder 13-2 storesdata supplied from the information processing controller 11. If it isnot necessary to discriminate the recorder 13-1 from the recorder 13-2,each recorder is simply referred to as a recorder 13.

Connected to the information processing controller 11 via the bus 14 arethe operation input unit 15, the communication unit 16, the display 17,and the drive 18. The operation input unit 15 includes keys, buttons, atouchpad, and a mouse. In response to a user operation input, theoperation input unit 15 supplies information responsive to the operationinput to the information processing controller 11 via the bus 14.

The communication unit 16 transmits the software cell, supplied from theinformation processing controller 11, to the information processingapparatuses 1-2 through 1-n via the network 2. The communication unit 16supplies, data transmitted from the information processing apparatuses1-2 through 1-n, to the information processing controller 11 via the bus14.

The display 17 includes a cathode-ray tube (CRT) or a liquid-crystaldisplay (LCD). The display 17 displays information (including datagenerated in the execution of an application program and notification toa user required to execute the application program) generated in theprocess of the information processing controller 11 and supplied via thebus 14.

If one of a magnetic disk 61, an optical disk 62, a magneto-optic disk63, and a semiconductor memory 64 is loaded onto the informationprocessing apparatus, the drive 18 drives the loaded medium to readprograms and data recorded thereon. The programs and data aretransferred to the information processing controller 11 via the bus 14as necessary, and are recorded onto the recorder 13 by the informationprocessing controller 11.

The information processing apparatuses 1-2 through 1-n have a structuresimilar to that of the information processing apparatus 1-1, and are notdiscussed further herein. Functions may added to or removed from theinformation processing apparatuses 1-2 through 1-n, and the informationprocessing apparatuses 1-2 through 1-n can have a structure adapted tothe function addition or function removal.

The information processing apparatus 1 includes a power supply 19 topower the entire circuitry thereof. FIG. 2 illustrates the structure ofthe power supply 19.

The power supply 19 includes a AC-DC converter 71 converting an ACcurrent from a commercial power source to a DC current, an AC inputdetector 72 detecting the supply of AC power to a power supply circuit76, a rechargeable battery 73, mounted at a predetermined location andcharged to predetermined power for supplying power to the informationprocessing apparatus 1, a battery detector 74 detecting the supply ofpower from the rechargeable battery 73, a charger circuit 75 chargingthe battery 73 with DC power from the AC-DC converter 71, and the powersupply circuit 76 supplying power to each block of the informationprocessing apparatus 1. In addition to the AC power and the rechargeablebattery, a dry battery may be used as a power source or the power supplycircuit 76. The power supply 19 of the information processing apparatus1 works with at least one of the power sources. Elements in theinformation processing apparatus 1 can operate from different operatingvoltages. The power supply circuit 76 can output a plurality ofvoltages. Alternatively, a plurality of power supply circuits 76 can bearranged for different voltages with one circuit on a per voltage basis.

The access process of the sub-processor 43 to the main memory 12 isdescribed below with reference to FIGS. 3 through 5.

As shown in FIG. 3, the main memory 12 contains memory locationsspecifying a plurality of addresses. Each memory location is assigned anadditional segment storing information relating to the state of data.The additional segment stores an F/E bit, a sub-processor ID and a localstorage (LS) address. Each memory location is assigned an access key tobe discussed later.

An F/E bit of “0” indicates that data is under process by thesub-processor 43 or data is invalid and not updated in its empty state.The F/E bit of “0” thus indicates that the data cannot be read from thatmemory location. Furthermore, the F/E bit of “0” indicates that data canbe written on that memory location. If data is written onto that memorylocation, the F/E bit is set to “1”.

The F/E bit of “1” indicates that the data of that memory location isnot yet read by the sub-processor 43 and is unprocessed and updateddata. The data of the memory location with the F/E bit of “1” isreadable. If the data is read by the sub-processor 43, the F/E bit isset to “0”. The F/E bit of “1” indicates that the corresponding memorylocation receives no data for data writing.

Read reserve can set in the memory location with the F/E bit of “0”(read disabled/write enabled state). To reserve a read operation in thememory location with the F/E bit of “0”, the sub-processor 43 writes asub-processor ID and a LS address of the sub-processor 43 as readreserve information onto the additional segment of the memory locationfor read reserve. When the sub-processor 43 writes data on theread-reserved memory location with the F/E bit shifted to “1” (readenabled/write disabled), the data can be read to the local storage 51identified by the sub-processor ID and the LS address written on theadditional segment as the read reserve information.

When a plurality of sub-processors 43 process data at multiple stages,the read and write of the data at each memory location are controlled asdescribed above. The sub-processor 43 performing a back stage processcan read front-stage processed data immediately after the sub-processor43 performing a front stage process writes processed data onto apredetermined address in the main memory 12.

As shown in FIG. 4, the local storage 51 in the sub-processor 43 iscomposed of memory locations, each specifying a plurality of addresses.Each memory location is assigned an additional segment. The additionalsegment includes a busy bit.

To read the data stored on the main memory 12 into the memory locationof the local storage 51 of the sub-processor 43, a corresponding busybit is set to “1” for reservation. No further data cannot be stored ontothe memory location with the busy bit at “1”. When the data is read intothe memory location of the local storage 51, the busy bit is set to “0”to allow other data to be stored.

As shown in FIG. 3, the main memory 12 connected to the informationprocessing controller 11 includes a plurality of sandboxes. The sandboxis used to fix an area in the main memory 12. Each sub-processor 43 isassigned a sandbox. The sub-processor 43 can exclusively use thatassigned sandbox. More specifically, the sub-processor 43 can use theassigned sandbox, but cannot access data beyond the area of the assignedsandbox.

The main memory 12 includes a plurality of memory locations, and eachsandbox is a set of memory locations.

A key management table of FIG. 5 is used to exclusively control the mainmemory 12. The key management table is recorded on the key managementtable recorder 45 and associated with the DMAC 44. Each entry in the keymanagement table includes a sub-processor ID, a sub-processor key, and akey mask.

To access the main memory 12, the sub-processor 43 outputs a readcommand or a write command to the DMAC 44. The command contains asub-processor ID identifying the sub-processor 43 and an address of themain memory 12 as an access target.

To execute the command from the sub-processor 43, the DMAC 44 checks thesub-processor key of the sub-processor 43 as an access requesting sourceby referencing the key management table. The DMAC 44 compares thechecked sub-processor key of the access requesting source with an accesskey assigned to the memory location of the main memory 12 as the accesstarget. Only if the two keys match, the DMAC 44 executes the commandsupplied from the sub-processor 43.

When any bit is shifted to “1” in the key mask recorded in the keymanagement table of FIG. 5, the bit corresponding to the sub-processorkey associated with the key mask is set to “0” or “1”.

For example, the sub-processor key is now “1010”. Accessing to only asandbox having an access key of “1010” is possible with thissub-processor key. If a key mask associated with the sub-processor keyis set to “0001”, a key mask bit set to “1” is masked from a matchdetermination between the sub-processor key and the access key (no matchdetermination is performed on a key mask bit set to “1”). With thesub-processor key “1010”, sandboxes having access keys of “1010” and“1011” are accessible.

The exclusiveness of the sandbox of the main memory 12 is thus assured.If a plurality of sub-processors 43 need to process data at multiplestages, only both the sub-processor 43 performing the front stageprocess and the sub-processor 43 performing the back stage process canaccess predetermined addresses of the main memory 12 to protect data.

The key mask value can be modified as discussed below. In theinformation processing apparatus 1-1, all key mask values are “0”. Aprogram loaded to the main processor 42 is now executed in cooperationwith a program loaded to the sub-processor 43. Resulting processed dataoutput from the sub-processor 43-1 is stored in the main memory 12. Tooutput the resulting processed data stored in the main memory 12 to thesub-processor 43-2, the area of the main memory 12 storing the resultingprocessed data output from the sub-processor 43-1 needs to be accessibleby each of the sub-processor 43-1 and the sub-processor 43-2. In such acase, the main processor 42 modifies the key mask values to set up anarea in the main memory 12 accessible by the plurality of sub-processors43. The multi-stage process is thus performed by the sub-processors 43.

More specifically, the sub-processor 43-1 performs a predeterminedprocess on data transmitted from the information processing apparatus1-2 through the information processing apparatus 1-n, and stores theprocessed data in a first area in the main memory 12. The sub-processor43-2 reads the data from the first area of the main memory 12, performsa predetermined process on the read data, and stores the processed dataonto a second area different from the first area in the main memory 12.

With a sub-processor key of the sub-processor 43-1 set to “0100”, anaccess key of the first area set to “0100”, a sub-processor key of thesub-processor 43-2 set to “0101”, and an access key of the second areaof the main memory 12 set to “0101”, the sub-processor 43-2 is unable toaccess the first area of the main memory 12. By modifying the key maskto “0001”, the sub-processor 43-2 can access the first area of the mainmemory 12.

FIGS. 6 and 7 illustrate one operation of the system in which theinformation processing apparatus 1-1 generates a software cell, anddistributes a process among the information processing apparatus 1-2through the information processing apparatus 1-n for execution.

The main processor 42 in the information processing apparatus 1-1generates a software cell containing commands, programs, and datarequired to perform the process, and transmits the generated softwarecell to the information processing apparatus 1-2 through the informationprocessing apparatus 1-n via the network 2.

FIG. 6 illustrates the structure of the software cell.

The software cell is composed of a source ID, a destination ID, aresponse destination ID, a cell interface, a DMA (direct memory access)command, a program, and data.

The source ID includes a network address of the information processingapparatus 1-1 as a source of the software cell, an informationprocessing apparatus ID of the information processing controller 11 inthe information processing apparatus 1-1, and identifiers of the mainprocessor 42 and the sub-processor 43 contained in the informationprocessing controller 11 in the information processing apparatus 1-1 (amain processor ID and a sub-processor ID).

The destination IDs include network addresses of the informationprocessing apparatus 1-2 through the information processing apparatus1-n as destinations of the software cell, information processingapparatus IDs of the information processing apparatus 1-2 through theinformation processing apparatus 1-n, and main processor IDs andsub-processor IDs of the information processing controllers 11 of theinformation processing apparatus 1-2 through the information processingapparatus 1-n.

The response destination IDs include a network address of theinformation processing apparatus 1-1 as a response destination of theexecution results of the software cell, the information processingapparatus ID of the information processing controller 11 of theinformation processing apparatus 1-1, and the identifiers of the mainprocessor 42 and the sub-processor 43 of the information processingcontroller 11 in the information processing apparatus 1-1.

The cell interface includes information required to use the softwarecell, and is composed of a global ID, information of a requiredsub-processor, a sandbox size, and a preceding software cell ID.

The global ID uniquely identifies the software cell over the entirenetwork 2, and is generated based on the source ID, and date and time ofgeneration or transmission of the software cell.

The information of the required sub-processor shows the number ofsub-processors required to execute the software cell. The sandbox sizeshows the memory capacities of the main memory and the local storage ofeach sub-processor required to execute the software cell.

The preceding software cell ID is an identifier of a preceding softwarecell within software cells forming one group requesting a sequentialexecution of streaming data.

The execution section of the software cell is composed of DMA commands,programs, and data. The DMA commands include a series of DMA commandsrequired to initiate the program. The programs include a sub-processorprogram to be executed by the sub-processor. The data here is to beprocessed by the programs including the sub-processor program.

The DMA commands include a load command, a kick command, a functionprogram execution command, a status request command, and a status replycommand.

The load command is used to load information stored in the main memory12 to the local storage of the sub-processor. The load command furtherincludes a main memory address, a sub-processor ID and an LS address.The main memory address identifies a predetermined area in the mainmemory as a load source of the information. The sub-processor ID and theLS address are respectively the identifier of the sub-processor as theload destination of the information and the address of the local storageof the sub-processor.

The kick command is used to start the execution of the program. The kickcommand further includes a sub-processor ID and a program counter. Thesub-processor ID identifies the sub-processor to be kicked, and theprogram counter provides an address to a program execution programcounter.

The function program execution command is used for a given apparatus(such as the information processing apparatus 1-1) to request anotherapparatus (such as one of the information processing apparatus 1-2through the information processing apparatus 1-n) to execute a functionprogram. Upon receiving the function program execution command, aninformation processing controller of the apparatus (such as one of theinformation processing apparatus 1-2 through the information processingapparatus 1-n) identifies, in response to a function program ID, thefunction program to be initiated.

The status request command is used to transmit, to the informationprocessing apparatus 1-1 as the response destination, device informationrelating to current operational status of the information processingapparatus 1-2 through the information processing apparatus 1-n, as thedestination IDs.

The status reply command is used for the information processingapparatus 1-2 through the information processing apparatus 1-n havingreceived the status request command to return the device information tothe information processing apparatus 1-1 pointed by the responsedestination ID contained in the status request command. The status replycommand is also used to store the device information onto data area ofthe execution section.

FIG. 7 illustrates the structure of the data area of the software cellwith a DMA command being a status reply command.

The information processing apparatus ID is an identifier identifying theinformation processing apparatus 1 including the information processingcontroller 11. The information processing apparatus IDs thus identifythe information processing apparatus 1-2 through the informationprocessing apparatus 1-n transmitting the status reply command. Theinformation processing apparatus 1-2 through the information processingapparatus 1-n are now powered on. The main processors 42 contained inthe information processing controllers 11 of the information processingapparatus 1-2 through the information processing apparatus 1-n generatethe information processing apparatus IDs, based on the date and time ofpower on, the network addresses of the information processing apparatus1-2 through the information processing apparatus 1-n, and the number ofsub-processors 43 contained in the information processing controllers 11of the information processing apparatus 1-2 through the informationprocessing apparatus 1-n.

The information processing apparatus IDs contain values indicative offeatures of the information processing apparatus 1-2 through theinformation processing apparatus 1-n. The values indicative of thefeatures of the information processing apparatus 1-2 through theinformation processing apparatus 1-n are information representing thetype of the apparatuses. For example, the information represents thateach of the information processing apparatus 1-2 through the informationprocessing apparatus 1-n is one of a hard disk recorder, a personaldigital assistants (Pads), a portable compact disk (CD) player. Theinformation processing apparatus ID can represent functions of theinformation processing apparatus 1-2 through the information processingapparatus 1-n, such as audio-visual recording, audio-visual playback.The values indicative of the features of the information processingapparatus 1-2 through the information processing apparatus 1-n aredetermined beforehand. Upon receiving the status reply command, theinformation processing apparatus 1-1 learns the features and thefunctions of the information processing apparatus 1-2 through theinformation processing apparatus 1-n by reading the informationprocessing apparatus IDs.

A master/slave (MS) status indicates which mode each of the informationprocessing apparatus 1-2 through the information processing apparatus1-n operates at. If the MS status is at “0”, the apparatus operates as amaster apparatus. If the MS status is at “1”, the apparatus operates asa slave apparatus.

A main processor operating frequency is an operating frequency of themain processor 42 in the information processing controller 11. A mainprocessor usage ratio is a usage ratio of the main processor 42 takinginto consideration all programs currently running on the main processor42. More specifically, the main processor usage ratio is a ratio of theoverall available performance of the main processor 42 to performancecurrently in use, and is calculated in million instruction per second(MIPS) or in a processor use time per unit time.

The number of sub-processors represents the number of sub-processors 43contained in the information processing controller 11. The sub-processorID is an identifier identifying the sub-processor 43 in the informationprocessing controller 11.

The sub-processor status indicates the status of each sub-processor 43,and can be one of “unused”, “reserved”, and “busy”. The status “unused”indicates that the sub-processor 43 is neither currently used norreserved. The status “reserved” indicates that the main processor 42 isnot currently used but reserved. The status “busy” indicates that thesub-processor 43 is currently used.

A sub-processor usage ratio indicates the usage ratio of thesub-processor 43 that currently executes the program or that is reservedfor the program. If a sub-processor status is “busy”, the sub-processorusage status indicates a current usage ratio. If the sub-processorstatus is “reserved”, the sub-processor usage status indicates anestimated usage ratio at which the sub-processor 43 is expected to run.

The sub-processor ID, the sub-processor status, and the sub-processorusage ratio are set in a combination for each sub-processor 43. Thenumber of combinations corresponds to the number of sub-processors 43 ina single information processing controller 11.

Main memory overall capacity is an overall memory capacity of the mainmemory 12 in the information processing controller 11, and main memoryused capacity is a currently used memory capacity of the main memory 12in the information processing controller 11.

The number of recorders indicates the number of recorders 13 connectedto the information processing controller 11. A recorder. ID uniquelyidentifies each recorder 13 connected to the information processingcontroller 11. A recorder type ID indicates the type of the recorder 13(for example, a hard disk, a CD-RW (compact disk rewritable), a CD+RW(compact disk plus rewritable), a DVD-RW (digital versatile diskrewritable), a DVD+RW (digital versatile disk plus rewritable), a memorydisk, SRAM (static random-access memory), or ROM (read-only memory)).

A recorder overall capacity indicates an overall storage capacity of therecorder 13 identified by the recorder ID, and a recorder used capacityindicates a currently used capacity of the recorder 13.

The recorder ID, the recorder type ID, the recorder overall capacity,and the recorder used capacity are set in a combination for eachrecorder 13. The number of combinations equals to the number ofrecorders 13 connected to the information processing controller 11. If aplurality of recorders 13 are connected to a single informationprocessing controller 11, the recorders 13 are assigned differentrecorder IDs, and the recorder type IDs, the recorder overall capacitiesand the recorder used capacities are managed on a per recorder basis.

The information processing apparatus 1-1 generates the software cell tocause the information processing apparatus 1-2 through the informationprocessing apparatus 1-n to perform distributed processing. Thegenerated software cell is then transmitted to the informationprocessing apparatus 1-2 through the information processing apparatus1-n.

Each piece of data is transmitted in a software cell to the informationprocessing apparatus 1-2 through the information processing apparatus1-n in the same manner as the software cell. The discussion of thetransmission of the data is thus omitted herein.

The main processor 42 contained in the information processing controller11 in one of the information processing apparatus 1-2 through theinformation processing apparatus 1-n generates the software cell havingthe structure discussed above, and transmits the generated software cellto the information processing controller 11 in the informationprocessing apparatus 1-1 via the network 2. An information processingapparatus 1 as a source, another information processing apparatus 1 as adestination, a third information processing apparatus 1 as a responsedestination, and an information processing controllers 11 of respectiveinformation processing apparatuses 1 are identified by theabove-referenced source ID, destination ID, and response destination ID.

The main processor 42 contained in the information processing controller11 in the information processing apparatus 1 having received thesoftware cell stores the software cell in the main memory 12 thereof.The main processor 42 as the destination reads the software cell andprocesses DMA commands contained in the software cell.

More specifically, the main processor 42 as the destination executes theload command. The main processor 42 loads information from an address inthe main memory 12 pointed by the load command onto a predetermined areaof the local storage 51 of the sub-processor 43 identified by thesub-processor ID and the LS address contained in the load command. Theinformation to be loaded herein includes the sub-processor programcontained the received software cell, data required to execute theprogram, and other specified data.

The main processor 42 outputs the kick command together with the programcounter contained in the kick command to the sub-processor 43 identifiedby the sub-processor ID contained in the kick command.

The specified sub-processor 43 executes the sub-processor program inaccordance with the kick command and the program counter. After storingthe execution results in the main memory 12, the sub-processor 43notifies the main processor 42 of the completion of the execution of theprogram.

A processor that performs the software cell in the informationprocessing controller 11 in the information processing apparatus 1 asthe destination is not limited to the sub-processor 43. The mainprocessor 42 can be specified as a processor to perform the functionprogram contained in the software cell.

In such a case, the information processing apparatus 1 as the sourcetransmits, to the information processing apparatus 1 as the destination,a software cell instead of the sub-processor program. The software cellcontains a main memory program and data to be processed by the mainmemory program and with a DMA command as a load command. The informationprocessing apparatus 1 as the destination stores the main memory programand the data to be processed by the main memory program. The informationprocessing apparatus 1 as the source transmits, to the informationprocessing apparatus 1 as the destination, identifiers including themain processor ID, the main memory address, the function program IDidentifying the main memory program of the information processingcontroller 11 in the information processing apparatus 1 as thedestination, and the software cell with the DMA command being the kickcommand or the function program command. The main processor 42 thusexecutes the main memory program.

In the network system of the embodiment of the present invention, theinformation processing apparatus 1 as the source of the software celltransmits, to the information processing apparatus 1 as the destination,the sub-processor program or the main memory program in the softwarecell. With the sub-processor program loaded onto the sub-processor 43 inthe information processing controller 11 in the information processingapparatus 1 as the destination, the information processing apparatus 1as the destination executes one of the sub-processor program and themain memory program.

If the software cell contains the sub-processor program, the informationprocessing controller 11 in the information processing apparatus 1 asthe destination of the software cell loads the sub-processor programonto the specified sub-processor 43. The specified sub-processor 43 thusperforms one of the sub-processor program and the main memory program inthe software cell.

Without a user intervention to operate the information processingapparatus 1 as the destination of the software cell, one of thesub-processor program and the main memory program is reassigned to theinformation processing apparatus 1 as the destination from theinformation processing apparatus 1 as the source. The informationprocessing controller 11 in the information processing apparatus 1 asthe destination executes one of the sub-processor program and the mainmemory program in the software cell. Data transfer is performed in a DMAmethod between the sub-processors 43. Using the above-referencedsandbox, a single information processing controller 11 processes datafast and at a high security level even when the data needs to beprocessed at multiple stages.

FIG. 8 illustrates the structure of a software program stored in themain memory 12 in each information processing controller 11. Beforepower on of the information processing apparatus 1, the software programis pre-stored in the recorder 13 connected to the information processingcontroller 11.

The programs are categorized into control programs, function programs,and device drivers by function or feature.

The control program is installed on the information processingcontrollers 11, and is executed by the main processor 42 in theinformation processing controller 11. If distributed processing isperformed by a plurality of information processing apparatuses 1, thecontrol program includes the MS (master/slave) manger and a capabilityinterchanging program.

The function program, executed by the main processor 42, is a so-calledapplication program. Each information processing controller 11 has itsown function program for recording, playback, material searching, forexample, in accordance with the function of the information processingapparatus 1.

The device driver is used to perform an input and output function(transmission and reception function) of data to the informationprocessing controller 11 or the information processing apparatus 1. Forexample, depending on the function of the information processingapparatus 1, the information processing controller 11 is provided with ainterfaces for broadcast receiving, monitor outputting, bitstreaminputting and outputting, and network inputting and outputting.

Loading of each program to the main memory 12 is described below withreference to FIG. 8.

The information processing apparatus 1 physically connected to thenetwork 2 via an interconnect cable (not shown) is switched on. Theinformation processing apparatus 1 is thus electrically and functionallyconnected to the network 2. The main processor 42 in the informationprocessing controller 11 of the information processing apparatus 1loads, to the main memory 12, programs categorized in the controlprogram and programs categorized in the device driver.

More specifically, the main processor 42 reads the program to be loadedfrom the recorder 13 by causing the DC 46 to execute a read command. Themain processor 42 writes the program onto the main memory 12 by causingthe DMAC 44 to execute a write command. As a result, the main processor42 loads, to the main memory 12, the programs categorized in the controlprogram and the program categorized in the device driver.

As for the programs categorized in the function program, only requiredones can be loaded to the main memory 12 under the control of the mainprocessor 42 when necessary. Alternatively, as the other categoryprograms, the function programs can be loaded to the main memory 12 atthe power on.

The function programs are assigned respective identifiers uniquelyidentifying themselves as function program IDs. The function program IDis determined at the production phase of the function program based onthe date and time of production and the information processing apparatusID.

It is not necessary to store the programs categorized in the functionprogram in the recorders 13 of all information processing apparatuses 1connected to the network 2. If the recorder 13 of one of the informationprocessing apparatuses 1 stores the function program, the functionprogram can be exchanged between the information processing apparatuses1 in the manner discussed above as necessary. A plurality of informationprocessing apparatuses 1 connected to the network 2 can function as avirtual single information processing apparatus to execute the functionprogram.

The MS manager and the capability interchanging program are discussedbelow.

Upon detecting that the information processing apparatus 1 is connectedto the network 2, the MS manager checks the presence of anotherinformation processing apparatus 1 connected to the network 2. Each ofthe word “connected” and the word “presence” means that the informationprocessing apparatus 1 is not only physically connected to the network 2but also electrically and functionally connected to the network 2.

More specifically, to verify the presence of another informationprocessing apparatus 1 connected to the network 2, the MS managergenerates a software cell with the DMA command being a status requestcommand, both a source ID and a response destination ID pointing to ownapparatus and no particular destination ID set, transmits the generatedsoftware cell, and sets a timer for network connection verification.Time-out time for the timer is 10 minutes, for example.

The main processor 42 in the information processing apparatus 1 reservesan area for device information (information relating to operationalstatus) on the main memory 12, and records, in a device informationtable, the information processing apparatus ID, the informationprocessing apparatus type ID, the sub-processor ID, the recorder ID, thenumber of recorders, and the recorder overall capacity.

If another information processing apparatus 1 is connected to thenetwork 2, the DMA command from the other connected informationprocessing apparatus 1 is a status reply command, and the software cellcontaining, as data, the device information recorded on the main memory12 in the other information processing apparatus 1 is returned. The MSmanager monitors the reception of the software cell of the status replycommand until time is up in the timer. If the status reply commandindicating the MS status=0 (master apparatus) is received, the MSmanager sets the MS status in the device information table of ownapparatus to “1”. In this way, the MS manager recognizes own apparatusas a slave apparatus. If no status reply command has been received atall until time is up, or if a status reply command indicating the MSstatus=0 (master apparatus) is not received at all until time is up, theMS manager sets the MS status in the device information table of ownapparatus to “0”. The MS manager recognizes own apparatus as a materapparatus.

Regardless of whether own apparatus is a mater or a slave apparatus, theMS manager references status information and monitors the states of theother apparatuses by regularly transmitting the status request commandto the network 2. If any change takes place in the connection state ofthe network 2, the MS manager notifies a capability interchangingprogram, to be discussed later, of the change.

If own apparatus is a master apparatus, the capability interchangingprogram acquires the device information of all other informationprocessing apparatuses 1, namely, the slave apparatuses, connected tothe network 2.

The apparatus generates the software cell with the DMA command being thestatus request command and transmits the software cell to the network 2to acquire the device information of the slave apparatuses. Theapparatus then receives the software cell with the SMA command being thestatus reply command and including the device information of the slaveapparatuses as data.

As the device information table of own apparatus as master apparatus,the capability interchanging program reserves an area in the main memory12 of own apparatus to store the device information of all slaveapparatuses connected to the network 2, and then records the deviceinformation as the device information table of the slave apparatuses.

More specifically, the device information of all information processingapparatuses 1 connected to the network 2 is stored in the main memory 12of the master apparatus as the device information table.

If own apparatus is a slave apparatus, the capability interchangingprogram acquires the device information of all other informationprocessing apparatuses connected to the network 2, and stores theinformation processing apparatus ID and the MS status contained in thedevice information onto the main memory 12. The device information ofown apparatus is recorded onto the main memory 12 of the slave apparatusas the device information table while the information processingapparatus IDs and the MS statuses of the other information processingapparatuses 1 (master and slave apparatuses) connected to the network 2are also recorded.

Regardless of whether own apparatus is a mater apparatus or a slaveapparatus, the capability interchanging program acquires, from the MSmanager, information relating to a change in the connection status ofthe network 2, for example, when a new information processing apparatus1 is connected to the network 2 or when an information processingapparatus 1 is disconnected from the network 2. The capabilityinterchanging program then updates the information recorded on the mainmemory 12.

The MS manager and the capability interchanging program can be executedby any of the main processor 42 and the sub-processors 43. The MSmanager and the capability interchanging program are preferably residentprograms that are continuously operative while the main power of theinformation processing apparatus 1 remains turned on.

The master apparatus in the distributed processing needs to monitor useroperation and the operation status of the slave apparatus. If the useroperates one of the information processing apparatuses 1 connected tothe network 2, the master apparatus directly learns operationinformation if the operated one is a master. If the user operates aslave apparatus, the operation information is transferred to a masterapparatus. Regardless of whether the operated apparatus is a materapparatus or a slave apparatus, the master apparatus remains keptinformed of the operation information. The operation information istransmitted in the software cell with the DMA command being an operationinformation transmission command.

The main processor 42 contained in the information processing controller11 of the master apparatus selects, in response to the operationinformation, a function program to be performed. As previouslydiscussed, the main processor 42 contained in the information processingcontroller 11 of the master apparatus loads the function program ontothe main memory 12 from the recorder 13 of own apparatus or anotherinformation processing apparatus (namely, a slave apparatus).

The function program defines required specifications, different fromexecution unit to execution unit, including the information processingapparatus type ID, the throughputs of the main processor and thesub-processor, the main memory usage ratio, conditions of an externalrecorder. The main processor 42 contained in the information processingcontroller 11 of the master apparatus reads required specifications foreach function program and references the device information tablepre-recorded on the main memory 12 by the capability interchangingprogram. The main processor 42 thus reads the device information of eachinformation processing apparatus 1 connected to the network 2.

The main processor 42 contained in the information processing controller11 of the master apparatus compares the device information of eachinformation processing apparatus 1 connected to the network 2 with therequired specifications of the function program. For example, if thefunction program requires a video recording function, only theinformation processing apparatus 1 having the recording function isidentified and extracted based on the information processing apparatustype ID. A slave apparatus satisfying the throughputs of the mainprocessor and the sub-processor required to execute the functionprogram, the main memory used capacity, and the conditions of theexternal recorder is identified as an execution request apparatuscandidate. If a plurality of execution request apparatus candidates areidentified, one of the candidates is selected.

The main processor 42 contained in the information processing controller11 of the master apparatus updates the device information table recordedon the main memory 12 of own apparatus regarding the execution requestapparatus candidate identified as a slave apparatus. The main processor42 further generates the software cell with the DMA commands being theload command and the kick command, sets information of the sub-processorrequired for the function program and the sandbox size, and transmitsthe software cell to the slave apparatus identified as the executionrequest apparatus candidate.

The slave apparatus requested to execute the function program executesthe function program, and updates the device information table recordedthereon. The main processor 42 contained in the information processingcontroller 11 of the slave apparatus loads the function program on themain memory 12 from the recorder 13 of own apparatus or from anotherinformation processing apparatus 1.

As the main memory program, if necessary, the sub-processor program istransmitted in the software cell to the other information processingapparatus 1 to be loaded onto the sub-processor 43 of the otherinformation processing apparatus 1. The other information processingapparatus 1 thus executes the sub-processor program.

Subsequent to the completion of the function program, the main processor42 in the information processing controller 11 of the slave apparatushaving executed the function program transmits an end notification tothe main processor 42 of the information processing controller 11 of themaster apparatus while updating the device information table recorded onown apparatus. Upon receiving the end notification of the execution ofthe function program, the main processor 42-1 in the informationprocessing controller 11 of the master apparatus updates a portion ofthe device information table recorded on own apparatus, corresponding tothe slave apparatus having executed the function program.

The master apparatus always needs to monitor the user operation and theoperation status of a slave apparatus. If an information processingapparatus 1 disconnected from the network 2 is a master apparatus in asingle virtual information processing apparatus executing the functionprogram, an information processing apparatus 1 having a minimum value ofinformation processing apparatus ID, from among information processingapparatuses 1 not disconnected from the network 2, is set as a masterapparatus.

The information processing controller 11 of one embodiment of thepresent invention can be implemented as a one-chip integrated circuitcontaining a plurality of sub-processors. Such a one-chip informationprocessing controller 11 inevitably results in high heat density incomparison with non-one-chip processors performing the same process. Atemperature detector using a temperature sensor can be arranged at eachof the main processor 42 and the sub-processor 43. Using the temperaturedetector, the main processor 42 and the sub-processor 43 are controlledto operate within a normal operating temperature range. With thisarrangement, device degradation is controlled, and highly reliableinformation processing controller 11 and information processingapparatus 1 are provided. In the information processing controller 11 inaccordance with one embodiment of the present invention, a process istransferred or interchanged between sub-processors of at least oneinformation processing apparatus 1 in response to a temperature rise.Device failure and a drop in processing speed due to heat are thusprevented.

The information processing controller 11 of the information processingapparatus 1 in accordance with a first embodiment of the presentinvention is described below with reference to FIGS. 9-17. Theinformation processing controller 11 performs distributed processingeven under temperature rise conditions.

FIG. 9 is a block diagram of an information processing apparatus 101 inwhich temperature detectors are arranged at the main processor 42 andthe sub-processor 43.

As shown in FIG. 9, elements described with reference to FIG. 1 aredesignated with the same reference numerals and the discussion thereofis omitted as appropriate. The information processing apparatus 101 ofFIG. 9 includes an information processing controller 111 instead of theinformation processing controller 11. A temperature detector 121-(m+2)(m is a number equal to the number of sub-processors 43 arranged in theinformation processing controller 111) is mounted to detect temperatureof the one-chip information processing controller 111. The rest of theinformation processing apparatus 101 is identical in structure to theinformation processing apparatus 1 of FIG. 1.

The information processing controller 111 includes a temperaturedetector 121-1 through a temperature detector 121-m measuringtemperatures of a sub-processor 43-1 through a sub-processor 43-m, and atemperature detector 121-(m+1) measuring temperature of the mainprocessor 42, and a temperature monitoring processor 122 monitoringtemperature measurements provided by the temperature detector 121-1through the temperature detector 121-(m+2) and outputting the monitoredtemperature measurements to the main processor 42 via the bus 41. Therest of the information processing controller 111 is identical instructure to the information processing controller 11 discussed withreference to FIG. 1.

The information processing apparatus 101 is not connected to the network2 in accordance with the first embodiment, and operates on a standalonebasis. In other words, the distributed processing is performed among thesub-processor 43-1 through the sub-processor 43-m in the informationprocessing controller 111 in the information processing apparatus 101 ofthe first embodiment of the present invention.

The chip structure of the information processing controller 11 isdescribed below with reference to FIG. 10. The DMAC 44, the keymanagement table recorder 45, the DC 46, and the temperature monitoringprocessor 122 are not shown in FIG. 10.

Mounted on the chip of the information processing controller 111 areeight processors of the sub-processor 43-1 through the sub-processor43-8 in a 4 by 2 layout (with the four processors on one side and theremaining four processors on the other side of the bus 41), and thelocal storage 51-2 through the local storage 51-9 respectivelycorresponding to the sub-processor 43-1 through the sub-processor 43-8.The main processor 42 is arranged close to the sub-processors 43 totransfer data at a high speed therebetween. Connected on one side of thebus 41 as shown in FIG. 10 are the sub-processor 43-1 through thesub-processor 43-4 in the order of small to large number with thesub-processor 43-1 closest to the main processor 42 and thesub-processor 43-4 farthest from the main processor 42. Connected on theother side of the bus 41 as shown in FIG. 10 are the sub-processor 43-5through the sub-processor 43-8 in the order from small to large numberwith the sub-processor 43-5 closest to the main processor 42 and thesub-processor 43-8 farthest from the main processor 42. A heat sink 141is attached to the chip of the information processing controller 111.

The temperature detector 121-1 through the temperature detector 121-8are arranged close to the sub-processor 43-1 through the sub-processor43-8, respectively. The temperature detector 121-9 is arranged in thevicinity of the main processor 42, and the temperature detector 121-10is arranged in the vicinity of the heat sink 141.

FIG. 11 illustrates the structure of a software program executed by theinformation processing controller 111 of the first embodiment of thepresent invention. The information processing controller 11 performs acontrol process in response to a temperature rise. The software programis pre-stored in the recorder 13 connected to the information processingcontroller 111 prior to the power on of the information processingapparatus 101.

As shown in FIG. 11, elements identical to those described withreference to FIG. 8 are designated with the reference numerals and thediscussion thereof are omitted as appropriate. A temperature managementprogram is added to and the MS manager and the capability interchangingprogram are removed from the control programs in the software structurestored in the main memory 12 in the information processing controller111 of the first embodiment. The rest of the software structure of FIG.11 is identical to the software structure of FIG. 8. The temperaturemanagement program is preferably a resident program that is continuouslyoperative while the main power of the information processing apparatus101 remains turned on.

The temperature detector 121-1 through the temperature detector 121-10in the information processing apparatus 101 measure temperatures of thesub-processors. The temperature monitoring processor 122 monitors theinformation of measured temperatures. The temperature management programgathers and manages the monitored temperature information. Based on thetemperature information, the temperature management program controls theprocess performed by the main processor 42, and the transfer or theinterchange of the process performed by the sub-processor 43-1 throughthe sub-processor 43-8 performed as necessary.

FIG. 12 is a functional block diagram of the software program of thefunction performed by the information processing apparatus 101. Thesoftware program has been discussed with reference to FIG. 11.

The functions of an arithmetic processor 161, a memory 162, a logicalthread management processor 163, and a temperature anomaly correctioncontroller 169 shown in FIG. 12 are basically carried out by the mainprocessor 42 in the information processing apparatus 101. The functionsof a temperature information acquisition unit 164, an interruptcontroller 165, a timer 166, a temperature management table 167, and atemperature rise detector 168 shown in FIG. 12 are basically carried outby the temperature monitoring processor 122 in the informationprocessing apparatus 101.

The functions of an arithmetic processor 181, a register 182, afloating-point register 183, a program counter 184, an interruptcontroller 185, and a thread transfer and interchange processor 186shown in FIG. 12 are basically carried out by the sub-processor 43 inthe information processing apparatus 101. A code area 187, a data area188, and a stack area 190 correspond to at least a portion of thestorage area of the local storage 51. FIG. 12 illustrates a singlecombination of sub-processor 43 and temperature detector 121. Allsub-processors 43 and temperature detectors 121 in the informationprocessing controller 111 are likewise connected.

The arithmetic processor 161 executes an arithmetic process for apredetermined application program. The memory 162 corresponds to atleast one portion of the storage area of the local storage 51-1, andstores a program performed by the arithmetic processor 161 and datarequired to execute the program. To cause at least one of thesub-processors 43 to perform distributed processing, the arithmeticprocessor 161 supplies setting information of a logical thread to thelogical thread management processor 163, thereby requesting the logicalthread management processor 163 to generate the logical thread. Thelogical thread is defined as a process unit that provides a singlefunction as a result of uniting a plurality of programs respectivelyassigned to a plurality of sub-processors 43. The plurality of programsmay belong to the same application program or different applicationprograms. In other words, the plurality of programs respectivelyassigned to the plurality of sub-processors 43 as necessary are thoserecorded on a predetermined storage area of the main memory 12. Inresponse to a request of the application program executed by thearithmetic processor 161, the programs are loaded to the local storage51 of the sub-processor 43 from the main memory 12 for execution.

The logical thread management processor 163 generates or deletes thelogical thread corresponding to the application program executed by thearithmetic processor 161, while monitoring the status of the generatedlogical thread and controlling the operation of the generated logicalthread. The logical thread management processor 163 generates a tablelisting entire management information of the information processingapparatus 101, and a table listing information required to execute thelogical thread on a per logical thread execution basis. The logicalthread management processor 163 controls the execution of the logicalthread by referencing and updating the tables as necessary.

At the control timing of the process of the interrupt controller 165,the temperature information acquisition unit 164 acquires thetemperature information supplied from the temperature detector 121, andupdates a temperature management table 167. The interrupt controller 165references the timer 166, and interrupts the temperature informationacquisition unit 164. In response to information supplied from thetemperature rise detector 168, the interrupt controller 165 interruptsthe arithmetic processor 161 and the temperature anomaly correctioncontroller 169.

The temperature management table 167 lists information for use intemperature management performed by the information processingcontroller 111. As shown in FIG. 13, the temperature management table167 lists a controller ID identifying the information processingcontroller 111, information relating to the operation status of thesub-processor 43-1 through the sub-processor 43-8, updated temperaturemeasurement results of the heat sink 141, the main processor 42, and thesub-processor 43-1 through the sub-processor 43-8 (in other words,temperature measurement results provided by the temperature detector121-1 through the temperature detector 121-10), temperature upper limitvalues of the heat sink 141, the main processor 42, and thesub-processor 43-1 through the sub-processor 43-8 (if the temperaturedetector 121-1 through the temperature detector 121-10 detecttemperatures above the temperature upper limits, a temperature anomalyis triggered), and layout information of the sub-processors in the chip.

The temperature upper limit of FIG. 13 is a specification value at thedesign stage of the information processing controller 111 and theinformation processing apparatus 101, and is an upper temperature limitof a required temperature range within which the normal operation of theinformation processing controller 111 and the information processingapparatus 101 is guaranteed. The temperature upper limit may be apreferred temperature upper limit below which a normal and efficientoperation of the information processing controller 111 and theinformation processing apparatus 101 is performed. The information ofthe operation status of the sub-processor 43-1 through the sub-processor43-8 indicates a run status or a stop status as to whether the apparatusis active or not. The sub-processor layout information indicates thelayout of the sub-processor 43-1 through the sub-processor 43-8 setbeforehand in the design stage of the information processing controller111 and the information processing apparatus 101. As shown in FIG. 10,the processor layout information includes information of the arrangementof the sub-processor 43-1 through the sub-processor 43-8 in aconfiguration of two rows by four columns, and informationcorrespondence between the layout and the sub-processor ID.

The temperature rise detector 168 references the temperature managementtable 167 to determine whether the temperature detection result of anyof the temperature detector 121-1 through the temperature detector121-10 rises above the temperature upper limit. If the temperature upperlimit is exceeded by any of the temperature detection results, thetemperature rise detector 168 notifies the interrupt controller 165 ofan abnormal temperature rise, thereby causing the interrupt controller165 to interrupt the arithmetic processor 161 and the temperatureanomaly correction controller 169.

In response to an interrupt from the interrupt controller 165, thetemperature anomaly correction controller 169 references the temperaturemanagement table 167. The temperature anomaly correction controller 169determines which of the information processing controller 111, the mainprocessor 42, and the sub-processors 43 corresponds to the temperaturedetector 121 that has detected the abnormal temperature rise. Bycontrolling the logical thread management processor 163, the temperatureanomaly correction controller 169 stops the process currently inprogress, as required, or transfers or interchanges the thread currentlyin progress with one of normal sub-processors 43.

Under the control of the logical thread management processor 163, thearithmetic processor 181 executes a program (thread) assigned by themain processor 42. The register 182 and the floating-point register 183are used by the arithmetic processor 181 that executes the program. Theprogram counter 184 indicates an address storing a command currentlyexecuted by the arithmetic processor 181.

Under the control of the logical thread management processor 163, theinterrupt controller 185 stops the process of the arithmetic processor181 if an interrupt is triggered, and causes the arithmetic processor181 to resume the process if the interrupt is released. Under thecontrol of the logical thread management processor 163, the programcurrently executed by own sub-processor is transferred to anothersub-processor 43, or is interchanged with another program executed byanother sub-processor 43. In this case, the thread transfer andinterchange processor 186 evacuates a content of the currently executedprogram (values of the register 182, the floating-point register 183,and the program counter 184) to the stack area 190. The thread transferand interchange processor 186 transfers the content of the stack area190 and the data area 189 to the local storage 51 of the sub-processor43 selected as a transfer target or an interchange target.

The code area 187 stores a code common to the sub-processors 43. Thedata area 188 stores fixed data. The data area 189 stores data differentfrom sub-processor to sub-processor. The stack area 190 receives theevacuated context of the currently executed program when the programcurrently executed by own sub-processor is transferred to anothersub-processor 43, or is interchanged with another program executed byanother sub-processor 43.

The process of the information processing controller 111 having thefunction discussed with reference to the functional block diagram ofFIG. 12 is specifically described below.

If an application program for processing three-dimensional graphics, aprocess of a single screen is partitioned by pixels, and the partitionedprocesses are calculated in parallel by a plurality of sub-processorsbased on the same program and the same model data. More specifically,when the arithmetic processor 161 executes an application program forprocessing three-dimensional graphics, processes partitioned by pixelare assigned to and calculated in parallel by a plurality ofsub-processors 43.

To request the logical thread management processor 163 to generate alogical thread, the arithmetic processor 161 determines beforehand thenumber of the sub-processors 43 to be used for the logical thread, andsupplies the logical thread management processor 163 with settinginformation of the logical thread. Herein, two sub-processors 43 areused. The logical thread management processor 163 loads the commonlyused program and model data required for the process to the code area187 and the data area 188 (local storage 51) of the sub-processor 43 towhich the distributed processing is assigned.

Optionally, the commonly used program and model data required for theprocess may be supplied beforehand to the local storage 51 of thesub-processor 43 to which no distributed processing is yet assigned. Aswill be discussed later, in the event of temperature rise, the loadingof the program and model data becomes unnecessary when the process ofthe logical thread is newly assigned (for process transfer or processinterchange) to the sub-processor 43 that has not been assigned thedistributed processing.

For example, if the sub-processors 43 assigned the distributedprocessing are the sub-processor 43-1 and the sub-processor 43-2, thearithmetic processor 181 of the sub-processor 43-1 calculates aluminance value at a position having coordinates (2x, y) on a screenwhile the arithmetic processor 181 of the sub-processor 43-2 calculatesa luminance value at a position having coordinates (2x+1, y).

With the information processing apparatus 101 operating, the interruptcontroller 165 continuously references the temperature management table167. At regular intervals, the interrupt controller 165 interrupts thetemperature information acquisition unit 164, thereby causing thetemperature information acquisition unit 164 to acquire the temperatureinformation of the temperature detector 121-1 through the temperaturedetector 121-10. The interrupt controller 165 thus updates the value ofthe temperature detection results in the temperature management table167.

The sub-processor 43-1 and the sub-processor 43-2 successively processthe threads assigned in response to the request of the applicationprogram processed by the arithmetic processor 161. With the calculationprocess in progress, the sub-processor 43-1 and the sub-processor 43-2generates heat as transistors contained therewithin perform a high-speedswitching operation. Heat generated by the main processor 42 and thesub-processors 43 performing the distributed processing assigned theretoaffect not only the switching operation of the transistors arrangedtherewithin but also adjacent processors. If processors working at ahigh-speed switching rate are present within a close range, thetemperatures of these processors substantially rise.

The temperature rise detector 168 references the temperature managementtable 167. Upon detecting that any of temperature detection results ofthe temperature detector 121-1 through the temperature detector 121-10is above a predetermined temperature upper limit, the temperature risedetector 168 notifies the interrupt controller 165 of an abnormaltemperature rise. In response to the notification from the temperaturerise detector 168, the interrupt controller 165 interrupts thearithmetic processor 161 and the temperature anomaly correctioncontroller 169.

When interrupted by the interrupt controller 165, the arithmeticprocessor 161 suspends the current process of the application program.When interrupted by the interrupt controller 165, the temperatureanomaly correction controller 169 references the temperature managementtable 167 to determine which of the information processing controller111, the main processor 42, and the sub-processors 43 corresponds to thetemperature detector 121 that has detected the abnormal temperaturerise. By controlling the logical thread management processor 163, thetemperature anomaly correction controller 169, as appropriate, stops theprocess, or transfers or interchanges the currently processed threadbetween the sub-processor 43 detected to be in abnormal temperature riseand a normal sub-processor 43.

More specifically, the temperature anomaly correction controller 169references the temperature management table 167. Upon determining thatthe sub-processor 43-1 corresponds to the temperature detector 121having detected the abnormal temperature rise, for example, thetemperature anomaly correction controller 169 references the temperaturemanagement table 167 to determine whether a sub-processor 43 can beselected as a transfer target to which the process of the thread beingexecuted by the sub-processor 43-1 is transferred.

Selected as a transfer target is one sub-processor 43 resulting in thelowest temperature measurement from among those that have remainedinoperative and are not closely located to the currently operatingsub-processor 43. If a plurality of sub-processors 43 satisfy thecriteria, a sub-processor 43 having the smallest sub-processor ID numberis selected as a transfer target. If sub-processors 43 that haveremained inoperative and are located far from the currently operatingsub-processor 43 are not available, one resulting in the lowesttemperature measurement is selected from among the currently inoperativesub-processors 43. If a plurality of sub-processors 43 satisfy thecriteria, a sub-processor 43 having the smallest sub-processor ID numberis selected as a transfer target.

If no currently inoperative sub-processors 43 are available, the processis interchanged rather than being transferred. A sub-processor 43resulting in the lowest temperature measurement is selected as aninterchange target. If a plurality of sub-processors 43 satisfy thecriteria, a sub-processor 43 having the smallest sub-processor ID numberis selected as an interchange target.

If the commonly used program and model data required to execute theprocess are supplied beforehand to the local storages 51 of onesub-processors 43 having no distributed processing assignment, thatsub-processors 43 may be selected with priority.

The temperature anomaly correction controller 169 references thetemperature management table 167. If the temperature anomaly correctioncontroller 169 determines that the temperature detector 121 havingdetected the abnormal temperature rise corresponds to the sub-processor43-1 from among the currently operating sub-processor 43-1 andsub-processor 43-2, the temperature anomaly correction controller 169references the temperature management table 167. The temperature anomalycorrection controller 169 then selects the sub-processor 43-4 assatisfying the above-referenced criteria from among the currentlyinoperative sub-processors 43-3 through 43-8.

The temperature anomaly correction controller 169 notifies the logicalthread management processor 163 that the sub-processor 43-4 has beenselected as the transfer target of the process of the sub-processor43-1. The logical thread management processor 163 stops the process, andevacuates the context of the process performed by the sub-processor43-1. The logical thread management processor 163 controls thesub-processor 43-1 to load the evacuated context to the sub-processor43-4 while modifying the operation status of the sub-processor 43-1 inthe temperature management table 167 to “stop”.

The interrupt controller 185 in the sub-processor 43-1 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43-4 as the transfer target pre-storesthe commonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area (not shown) managedby the logical thread management processor 163 (a portion of the storagearea of the local storage 51 of the main processor 42). If thesub-processor 43-4 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area (not shown) managed by the logical thread managementprocessor 163 (the portion of the storage area of the local storage 51of the main processor 42).

The logical thread management processor 163 supplies, to thesub-processor 43-4 as the transfer target, the evacuated data to storethe evacuated data on areas corresponding to the code area 187 throughthe stack area 190. The evacuated data is the content of the stack area190 and the data area 189 if the sub-processor 43-4 as the transfertarget pre-stores the commonly used program and model data, and is thedata of the code area 187 through the stack area 190 if thesub-processor 43-4 as the transfer target does not pre-store commonlyused program and model data.

The interrupt controller 165 releases the interrupt to the arithmeticprocessor 161. The arithmetic processor 161 requests again the logicalthread management processor 163 to execute the logical thread. Thelogical thread management processor 163 starts the distributedprocessing on the sub-processor 43-2 and the sub-processor 43-4.

The temperature anomaly correction controller 169 references thetemperature management table 167. If the temperature anomaly correctioncontroller 169 determines that the temperature detector 121 havingdetected the abnormal temperature rise corresponds to one of theinformation processing controller 111 and the main processor 42, thetemperature anomaly correction controller 169 controls the logicalthread management processor 163 to temporarily suspend the applicationprogram executed by the arithmetic processor 161. The logical threadmanagement processor 163 causes the main processor 42 to temporarilystop the process to lower the amount of generated heat, except arequired portion of the program executed by a resident program. Thetemperature anomaly correction controller 169 references the temperaturemanagement table 167 and waits on standby until the abnormal temperaturerise is no longer detected. When a normal temperature state is restored,or the temperature value drops below a predetermined threshold, theprocess of the main processor 42, namely, the process of the applicationprogram executed by the arithmetic processor 161 resumes.

As previously discussed, the functions of the arithmetic processor 161,the memory 162, the logical thread management processor 163, and thetemperature anomaly correction controller 169 shown in FIG. 12 arebasically carried out by the main processor 42 in the informationprocessing apparatus 101. The functions of the temperature informationacquisition unit 164, the interrupt controller 165, the timer 166, thetemperature management table 167, and the temperature rise detector 168shown in FIG. 12 are basically carried out by the temperature monitoringprocessor 122 in the information processing apparatus 101. Hardwareperforming the above function may be different from the above-referencedstructure. For example, part of the function of the main processor 42may be carried out by the temperature monitoring processor 122, part ofthe function of the temperature monitoring processor 122 may beperformed by the main processor 42, or these functions may be performedby different hardware. Even in such a case, the present invention isperfectly applicable.

A application program execution process 1 executed by the informationprocessing apparatus 101 of the first embodiment of FIG. 9 is describedbelow with reference to a flowchart of FIG. 14. The temperaturemanagement program is a resident program that is continuously operativewhile the main power of the information processing apparatus 101 remainsturned on.

In step S1, the arithmetic processor 161 determines whether a user hasinput a command to execute the application program. More specifically,in step S1, the main processor 42 determines, in response to a signalsupplied from the operation input unit 15 via the bus 14 and the bus 41,whether the command to execute the application program has been issued.If it is determined in step S1 that the command to execute theapplication program has not been issued, the process of S1 is repeateduntil it is determined that the command to execute the applicationprogram has been issued.

If it is determined in step S1 that the command to execute theapplication program has been issued, the arithmetic processor 161 setsthe assignment of the logical thread to the sub-processors and suppliesthe setting information of the logical thread to the logical threadmanagement processor 163 in step S2.

In step S3, the logical thread management processor 163 loads a programand data for executing the assigned process to the code area 187 and thedata area 188 of the local storage 51 in the sub-processor 43 to whichthe logical thread is assigned.

In step S4, the arithmetic processor 161 and the logical threadmanagement processor 163 control the execution of the applicationprogram including the process of the sub-processor 43. The arithmeticprocessor 181 in the sub-processor 43 performs the assigned process.

The temperature management program is a resident program that iscontinuously operative while the main power of the informationprocessing apparatus 101 remains turned on, and the process is performedthroughout a period while steps S1 through S4 are executed. Thetemperature information management process 1 of the temperaturemanagement program will be described later with reference to a flowchartof FIG. 15.

In step S5, the arithmetic processor 161 determines whether an interruptresponsive to the occurrence of a temperature anomaly is issued from theinterrupt controller 165. If it is determined in step S5 that aninterrupt responsive to the occurrence of a temperature anomaly is notissued, processing proceeds to step S8.

If it is determined in step S5 that an interrupt responsive to theoccurrence of a temperature anomaly is issued, the current process issuspended. In step S6, the arithmetic processor 161 determines whetherthe interrupt is released. If it is determined in step S6 that theinterrupt is not yet released, the process at step S6 is repeated untilit is determined that the interrupt has been released.

If it is determined in step S6 that the interrupt has been released, thearithmetic processor 161 supplies the logical thread managementprocessor 163 with the setting information of the logical thread asnecessary in step S7. The logical thread management processor 163 thusupdates the table relating to the logical thread management.

If it is determined in step S5 that the interrupt responsive to theoccurrence of a temperature anomaly has not been issued, the arithmeticprocessor 161 determines in step S8 subsequent to the end of step S7whether the process of the application program has been completed. If itis determined in step S8 that the process of the application program hasnot been completed, processing returns to step S4 to repeat step S4 andsubsequent steps. If it is determined in step S8 that the process of theapplication program has been completed, the process ends.

In this way, the selected sub-processor 43 performs the distributedprocessing corresponding to the application program performed by themain processor 42.

The temperature information management process 1 executed by theinformation processing apparatus 101 of FIG. 9 (more specifically,executed by the temperature management program of FIG. 11) is describedbelow with reference to a flowchart of FIG. 15.

In step S21, the temperature information acquisition unit 164 determineswhether a timer interrupt is received from the interrupt controller 165.If it is determined in step S21 that a timer interrupt has not beenreceived, the process in step S21 is repeated until it is determinedthat a timer interrupt has been received.

If it is determined in step S21 that a timer interrupt has beenreceived, the temperature information acquisition unit 164 acquirestemperature information from each of the temperature detectors 121 instep S22.

In step S23, the temperature information acquisition unit 164 updatesthe temperature management table 167 based on the temperatureinformation acquired in step S22.

In step S24, the temperature rise detector 168 references thetemperature management table 167 to determine whether an abnormal valueis contained in the temperature information, in other words, whether anyof the temperature detection results detected by the temperaturedetectors 121 is above the predetermined temperature upper limit. If itis determined in step S24 that no abnormal value is contained in thetemperature information, processing returns to step S21 to repeat stepS21 and subsequent steps.

If it is determined in step S24 that an abnormal value is contained inthe temperature information, the temperature rise detector 168 notifiesthe interrupt controller 165 of the detection of the abnormaltemperature rise, thereby causing the interrupt controller 165 tointerrupt the arithmetic processor 161 and the temperature anomalycorrection controller 169 in step S25. The interrupt controller 165interrupts the arithmetic processor 161 and the temperature anomalycorrection controller 169, thereby stopping the process of theapplication program controlled by the arithmetic processor 161 andcausing the temperature anomaly correction controller 169 to start ananomaly-time process 1.

In step S26, the anomaly-time process 1 to be discussed later withreference to FIG. 16 is performed.

In step S27, the temperature anomaly correction controller 169 controlsthe logical thread management processor 163 in response to theanomaly-time process 1, thereby causing the logical thread managementprocessor 163 to update a table of logical thread management asnecessary.

In step S28, the interrupt controller 165 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161. Processing returns to step S21 to repeat step S21 andsubsequent steps.

The temperature information detected by the temperature detectors 121 isthus acquired, and whether to perform an interrupt process at theoccurrence of temperature anomaly is determined based on the temperaturemanagement table 167 that is updated in response to the detectedtemperature information.

The anomaly-time process 1 executed in step S26 of FIG. 15 is describedbelow with reference to a flowchart of FIG. 16.

In step S41, the temperature anomaly correction controller 169references the temperature management table 167, and determines which ofthe main processor 42 and the information processing controller 111suffers from the temperature anomaly, in other words, which of thetemperature detector 121-9 and the temperature detector 121-10 hasdetected temperatures above the predetermined temperature upper limit.If it is determined in step S41 that one of the main processor 42 andthe information processing controller 11 causes the temperature anomaly,processing proceeds to step S53 as described below.

If it is determined in step S41 that neither the main processor 42 northe information processing controller 111 causes the temperatureanomaly, in other words, that any of the sub-processors 43 has causedthe temperature anomaly, the temperature anomaly correction controller169 references the temperature management table 167. The temperatureanomaly correction controller 169 thus determines whether the process ofthe sub-processor 43 detected to be in temperature anomaly istransferable, in other words, whether any of sub-processors 43 otherthan the sub-processor 43 detected to be in temperature anomaly is notcurrently operating. If it is determined in step S42 that the process ofthe sub-processor 43 detected to be in temperature anomaly is nottransferable, processing proceeds to step S47.

If it is determined in step S42 that the process of the sub-processor 43detected to be in temperature anomaly is transferable, the temperatureanomaly correction controller 169 selects a sub-processor 43 as atransfer target of the process, and notifies the logical threadmanagement processor 163 of the selection results in step S43. Morespecifically, the temperature anomaly correction controller 169 selects,as a transfer target with priority, one sub-processor 43 resulting inthe lowest temperature measurement from among those that have remainedinoperative and are not closely located to the currently operatingsub-processor 43. If a plurality of sub-processors 43 satisfy thecriteria, the temperature anomaly correction controller 169 selects asub-processor 43 having the smallest sub-processor ID number as atransfer target. If sub-processors 43 that have remained inoperative andare located far from the currently operating sub-processor 43 are notavailable, one resulting in the lowest temperature measurement isselected from among the currently inoperative sub-processors 43. If aplurality of sub-processors 43 satisfy the criteria, a sub-processor 43having the smallest sub-processor ID number is selected as a transfertarget. The temperature anomaly correction controller 169 then notifiesthe logical thread management processor 163 of the selection results.

As shown in FIG. 17A, the currently operating sub-processors are thesub-processor 43-1 and the sub-processor 43-2, and the temperaturedetector 121 detecting the abnormal temperature rise corresponds to thesub-processor 43-1. In this case, the temperature anomaly correctioncontroller 169 references the temperature management table 167, anddetermines that the sub-processor 43-4 from among the sub-processor 43-3through the sub-processor 43-8 satisfy the above-referenced criteria,and selects the sub-processor 43-4 as a transfer target.

In step S44, the logical thread management processor 163 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit. The interrupt controller 185 ofthe sub-processor 43 detected to be above the temperature upper limitsuspends the process of the arithmetic processor 181 in response to aninterrupt command to evacuate the currently processed context. Thethread transfer and interchange processor 186 evacuates the context ofthe currently executed program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 163 (a portion of the storage areaof the local storage 51 of the main processor 42). If the sub-processor43 does not pre-store commonly used program and model data, the threadtransfer and interchange processor 186 transfers the data of the codearea 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 163 (the portion ofthe storage area of the local storage 51 of the main processor 42).

In step S45, the logical thread management processor 163 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S46, the logical thread management processor 163 restores thecontext evacuated in step S44 to the sub-processor 43 selected as thetransfer target. The sub-processor 43 selected as the transfer targetstores the supplied context onto the areas of the code area 187 throughthe stack area 190. The process then returns to step S26 and thenproceed to step S27 of FIG. 15.

If it is determined in step S42 that the process of the sub-processor 43detected to be in temperature anomaly is not transferable, thetemperature anomaly correction controller 169 selects a sub-processor 43as an interchange target and notifies the logical thread managementprocessor 163 of the selection result in step S47. More specifically,the temperature anomaly correction controller 169 is designed to selecta sub-processor 43 resulting in the lowest temperature measurement as aninterchange target with priority. If a plurality of sub-processors 43satisfying the above criteria are available, a sub-processor 43 havingthe smallest sub-processor ID number is selected.

In step S48, the logical thread management processor 163 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit. The interrupt controller 185 ofthe sub-processor 43 detected to be above the temperature upper limitsuspends the process of the arithmetic processor 181 in response to aninterrupt command to evacuate the currently processed context. Thethread transfer and interchange processor 186 evacuates the context ofthe currently executed program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 163 (a portion of the storage areaof the local storage 51 of the main processor 42). If the sub-processor43 does not pre-store commonly used program and model data, the threadtransfer and interchange processor 186 transfers the data of the codearea 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 163 (the portion ofthe storage area of the local storage 51 of the main processor 42).

In step S49, the logical thread management processor 163 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S50, the logical thread management processor 163 evacuates thecontext of the process being executed by the sub-processor 43 selectedas the interchange target. The interrupt controller 185 of thesub-processor 43 selected as the interchange target suspends the processof the arithmetic processor 181 in response to an interrupt command toevacuate the currently processed context. The thread transfer andinterchange processor 186 evacuates the context of the currentlyexecuted program (the values of the register 182, the floating-pointregister 183, and the program counter 184) to the stack area 190. If thesub-processor 43 as the interchange target pre-stores the commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the content of the stack area 190 and the data area 189 toan information storage area managed by the logical thread managementprocessor 163 (a portion of the storage area of the local storage 51 ofthe main processor 42). If the sub-processor 43 does not pre-storecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 163 (the portion of the storagearea of the local storage 51 of the main processor 42).

In step S51, the logical thread management processor 163 stops theoperation of the sub-processor 43 selected as the interchange target ofthe process.

In step S52, the logical thread management processor 163 interchangescontexts between the two context-evacuated sub-processors 43 to restorethe context there. More specifically, the logical thread managementprocessor 163 restores the context, evacuated in step S48, to thesub-processor 43 selected as the interchange target of the process whilerestoring the context, evacuated in step S50, to the sub-processor 43detected to be above the temperature upper limit. Each sub-processor 43stores the supplied contexts on corresponding areas of thefloating-point register 183 through the stack area 190. The process thenreturns to step S26 and then proceeds to step S27 of FIG. 15.

If it is determined in step S41 that one of the main processor 42 andthe information processing controller 111 suffers from the temperatureanomaly, the temperature anomaly correction controller 169 controls thelogical thread management processor 163, thereby suspending the processof the application program executed by the arithmetic processor 161 instep S53. The process of the main processor 42 is thus temporarilysuspended except a required portion of the process executed by theresident program.

In step S54, the temperature anomaly correction controller 169references the temperature management table to determine whether thenormal temperature state is restored. If it is determined in step S54that the normal temperature state is not yet restored, the process instep is repeated until it is determined that the normal temperaturestate is restored. If it is determined in step that the normaltemperature state is restored, processing returns to step S26 and thenproceeds to step S27 of FIG. 15.

In this way, whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined depending on the location of thetemperature anomaly, the operation of the chip, and the temperaturemeasurement values of the processors. One of the transfer target and theinterchange target is also determined.

The information processing apparatus 101, including the temperaturedetectors 121 arranged on the main processor 42, and the sub-processors43, is operated on a standalone fashion without being connected to anetwork. The information processing apparatus 101 monitors thetemperature anomaly. If any temperature anomaly is detected, whether tosuspend the process, whether to transfer part of the distributedprocessing, or whether to interchange part of the distributed processingis determined depending on the location of the temperature anomaly, theoperation of the chip, and the temperature measurement values of theprocessors. The transfer target or the interchange target of the processis also determined, and the process is transferred or interchanged. Thedevice failure due to runaway or malfunction caused by heat and drop inthe processing speed are prevented while the suspension of the processin the middle thereof is minimized.

The information processing apparatus 101 operates in a standalonefashion with no connection established to the network 2 in the processdiscussed with reference to FIGS. 9 through 7. The present invention isapplicable to the case in which a plurality of information processingapparatuses 101 are connected to the network 2 as shown in FIG. 18.

An information processing controller 111 in the information processingapparatus 101 in accordance with a second embodiment of the presentinvention is described below with reference to FIGS. 18-33. Theinformation processing controller 111 performs distributed processing intemperature rise.

FIG. 18 illustrates a network system that performs distributedprocessing among a plurality of information processing apparatuses 101in response to temperature rise. An information processing apparatus101-1 through an information processing apparatus 101-n are basicallyidentical in hardware structure to the information processing apparatus101 previously discussed with reference to FIG. 9. The informationprocessing controller 111 in each of the information processingapparatus 101-1 through the information processing apparatus 101-n isbasically identical in hardware structure to the one-chip processorpreviously discussed with reference to FIG. 10.

As shown in FIG. 19, the information processing controller 111 havingthe same structure as the one-chip processor discussed with reference toFIG. 10 is connected to the network 2 via the bus 14 and thecommunication unit 16. As previously discussed, one of the informationprocessing apparatus 101-1 through the information processing apparatus101-n is recognized as a master apparatus, and the other apparatuses arerecognized as slave apparatuses.

FIG. 20 illustrates the structure of a software program executed by theinformation processing controller 111 of the second embodiment. Thesoftware program is pre-recorded on the recorder 13 connected to theinformation processing controller 111 prior to the switching of theinformation processing apparatus 101.

Elements identical to those described with reference to FIG. 8 aredesignated with the same reference numerals and the discussion thereofis omitted herein. The structure of the software program stored in themain memory 12 of the information processing controller 111 of thesecond embodiment remains unchanged from the software structurediscussed with reference to FIG. 8 except that a temperature managementprogram is newly added to the control programs. The temperaturemanagement program is preferably a resident program that is continuouslyoperative as long as the main power of the information processingapparatus 101 remains turned on.

The temperature management program of FIG. 20 performs the same processas described in the first embodiment of FIG. 11. The temperaturedetector 121-1 through the temperature detector 121-10 detecttemperatures of the information processing apparatuses 101. Thetemperature monitoring processor 122 monitors the temperatures. Thetemperature management program gathers and manages information of thetemperatures. Based on the temperature information, the temperaturemanagement program controls the process executed by the main processor42 and the transfer or interchange of the process executed by thesub-processor 43-1 through the sub-processor 43-8 as necessary. Thetemperature management program exchanges the temperature informationwith the other information processing apparatuses 101 connected to thenetwork 2, and then controls the process executed by the main processor42 and the transfer or interchange of the process executed by thesub-processor 43-1 through the sub-processor 43-8 as necessary.

The control of exchanging the temperature information with the otherinformation processing apparatuses 101 via the network 2, and thecontrol of the transfer or interchange of the process with the otherinformation processing apparatuses 101 via the network 2 are dividedinto the following three patterns.

In a first pattern, the information processing apparatus 101-1, ifidentified as a master apparatus, manages own temperature managementtable but also temperature management tables of the informationprocessing apparatus 101-2 through the information processing apparatus101-n as slave apparatuses. More specifically, each of the informationprocessing apparatus 101-2 through the information processing apparatus101-n, as the slave apparatuses, regularly transmits an updatedtemperature management table thereof to the information processingapparatus 101-1. The information processing apparatus 101-1 as themaster apparatus monitors the temperature information of all informationprocessing apparatuses 101-1 through 101-n, and if an abnormaltemperature rise is detected in any of the information processingapparatuses 102-1 through 102-n, the information processing apparatus101-1 selects an appropriate sub-processor 43 as a transfer target or aninterchange target of the process from all sub-processors 43 containedin the information processing controllers 111 of the informationprocessing apparatuses 101 connected to the network 2. The informationprocessing apparatus 101-1 performs control process to transfer theprocess of the sub-processor 43 detected to be in anomaly to theselected sub-processor 43 or to interchange the processes between thetwo sub-processors 43.

In a second pattern, the information processing apparatus 101 monitorsthe temperature management table of its own, and if an abnormaltemperature rise is detected in the temperature management table, theinformation processing apparatus 101 transmits, to all other informationprocessing apparatuses 101, a command requesting all other informationprocessing apparatuses 101 to transmit the temperature information. Morespecifically, upon receiving a command requesting the transmission ofthe temperature information, an information processing apparatus 101 notdetecting any temperature rise generates a command to transmit thetemperature information based on own temperature management table, andtransmits a command to reply the generated temperature information tothe information processing apparatus 101 as a source of the temperatureinformation request command. Upon receiving the temperature informationrely command, the information processing apparatus 101 selects anappropriate sub-processor 43 as a transfer target or an interchangetarget of the process from all sub-processors 43 contained in theinformation processing controllers 111 of the information processingapparatuses 101 connected to the network 2. The information processingapparatus 101 performs control process to transfer the process of thesub-processor 43 detected to be in anomaly to the selected sub-processor43 or to interchange the processes between the two sub-processors 43.

In a third pattern, each information processing apparatus 101 monitorsown temperature management table, and if an abnormal temperature rise isdetected in the temperature management table, the information processingapparatus 101 transmits, to all other information processing apparatuses101, a command requesting all other information processing apparatuses101 to transfer sub-processor programs. More specifically, uponreceiving a command requesting the transfer of the sub-processor programfrom the other information processing apparatus 101, an informationprocessing apparatus 101 not detecting any temperature rise generates,based on own temperature management table, a reply command indicatingwhether own apparatus can be a transfer target of the sub-processorprogram. The information processing apparatus 101 then transmits thereply command to the information processing apparatus 101 as the sourceof the command requesting the transfer of the sub-processor program.Upon receiving the temperature information rely command, the informationprocessing apparatus 101 selects an appropriate sub-processor 43 as atransfer target or an interchange target of the process from allsub-processors 43 contained in the information processing controllers111 of the information processing apparatuses 101 connected to thenetwork 2. The information processing apparatus 101 performs controlprocess to transfer the process of the sub-processor 43 detected to bein anomaly to the selected sub-processor 43 or to interchange theprocesses between the two sub-processors 43.

FIG. 21 is a functional block diagram of the information processingcontroller 111 that performs the control process in the first pattern inaccordance with the second embodiment of the present invention. Elementsidentical to those described with reference to FIG. 12 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the first pattern of the information processingcontroller 111 of the second embodiment as shown in FIG. 12, the mainprocessor 42 additionally includes an MS management processor 211, acapability interchanging processing controller 212, a memory 213, and atemperature management information transmission and reception controller214. The main processor 42 further includes a temperature anomalycorrection controller 216 in place of the temperature anomaly correctioncontroller 169, and a logical thread management processor 217 in placeof the logical thread management processor 163. The rest of the mainprocessor 42 remains unchanged from the main processor 42 of FIG. 12.The temperature monitoring processor 122 includes a temperaturemanagement table 215 in place of the temperature management table 167,and the rest of the temperature monitoring processor 122 remainsunchanged from the temperature monitoring processor 122 of FIG. 12.

Hardware performing the above function may be different from theabove-referenced structure. For example, part of the function of themain processor 42 may be carried out by the temperature monitoringprocessor 122, part of the function of the temperature monitoringprocessor 122 may be performed by the main processor 42, or thesefunctions may be performed by different hardware. Even in such a case,the present invention is perfectly applicable.

Upon detecting that own apparatus is connected to the network 2, the MSmanagement processor 211 generates a software cell with a DMA commandbeing a status requesting command, both a source ID and a responsedestination being own apparatus, and a destination ID unfixed, andtransmits the generated software cell to the network 2 via thecommunication unit 16. The MS management processor 211 then receives asoftware cell with a DMA command being a status reply command andincluding, as data, device information stored in the main memory 12 inthe other information processing apparatus 101. The MS managementprocessor 211 thus recognizes whether own apparatus, from among theinformation processing apparatuses 101 connected to the network 2, is amater apparatus or a slave apparatus. If own apparatus 101 is a masterapparatus, the capability interchanging processing controller 212acquires the device information of all information processingapparatuses 101, as slave apparatuses, connected to the network 2, andstore the device information on the memory 213. If own apparatus 101 isa slave apparatus, the capability interchanging processing controller212 acquires the information processing apparatus ID and the MS managercontained in the device information of all other information processingapparatuses 101, and stores the information processing apparatus ID andthe MS manager onto the memory 213.

The memory 213, corresponding to part of the storage area of the mainmemory 12, stores at least a portion of the device information of theinformation processing apparatus 101 connected to the network 2. Underthe control of the temperature anomaly correction controller 216, thetemperature management information transmission and reception controller214 controls the transmission of the temperature management table or avariety of commands (software cell) generated for temperature managementto the other information processing apparatuses 101 connected to thenetwork 2 via the communication unit 16. The temperature managementinformation transmission and reception controller 214 controls thereception of the temperature management table of the other informationprocessing apparatuses 101 or a variety of commands (software cell)generated for temperature management from the other informationprocessing apparatuses 101 connected to the network 2 via thecommunication unit 16. The temperature management table or the varietyof commands (software cell) generated for temperature management arecollectively referred to as temperature management information if thereis no need for discriminating information relating to temperaturemanagement of a plurality of information processing apparatuses 101connected to the network 2 from information relating to the control ofdistributed processing executed based on the temperature management.

If own apparatus 101 is a master apparatus, the temperature managementtables 215 include not only own temperature management table updatedbased on the information acquired by the temperature informationacquisition unit 164 but also temperature management tables transmittedfrom the other information processing apparatuses 101 and received inthe process of the temperature management information transmission andreception controller 214. If own apparatus 101 is a slave apparatus, thetemperature management table 215 includes own temperature managementtable updated based on the information acquired by the temperatureinformation acquisition unit 164.

If own apparatus 101 is a master apparatus, the temperature anomalycorrection controller 216 references the temperature management table215 in response to an interrupt from the interrupt controller 165. Thelogical thread management processor 217 thus detects which of theinformation processing apparatuses 101 connected to the network 2corresponds to a temperature detector 121 having detected an abnormaltemperature rise, and which of the main processor 42, and thesub-processors 43 corresponds to the temperature detector 121 havingdetected the abnormal temperature. Based on the detection results, thetemperature anomaly correction controller 216 controls the logicalthread management processor 217, thereby stopping the process, ortransferring the process to or interchanging the process with one of thesub-processors 43.

The logical thread management processor 217 generates or deletes thelogical thread corresponding to the application program executed by thearithmetic processor 161. If own apparatus 101 is a master apparatus,the logical thread management processor 217 monitors the status of thegenerated logical thread and controls the operation of the generatedlogical thread corresponding to the distributed processing performed byone of the information processing apparatuses 101 connected to thenetwork 2. If own apparatus 101 is a master apparatus, the logicalthread management processor 217 generates a table listing managementinformation of all information processing apparatuses 101 connected tothe network 2, and a table listing information required to execute thelogical thread on a per logical thread execution basis. The logicalthread management processor 217 controls the execution of the logicalthread by referencing and updating the tables as necessary.

If own apparatus is a master apparatus, the logical thread managementprocessor 217 generates a software cell for controlling the process ofthe software cell executed by another information processing apparatus101, and transmits the generated software cell via the communicationunit 16. Furthermore, if own apparatus is a slave apparatus, the logicalthread management processor 217 receives, via the communication unit 16,a software cell transmitted from a master information processingapparatus 101. The logical thread management processor 217 causes thesub-processor 43 to perform the distributed processing responsive to thesoftware cell, generates a software cell corresponding to a reply or aresponse, and transmits the generated software cell via thecommunication unit 16. Regardless whether own apparatus 101 is a masterapparatus or a slave apparatus, the logical thread management processor217 acquires, via the communication unit 16, information relating to athread already executed by another information processing apparatus 101.

The operation of the first pattern of the second embodiment is describedbelow with reference to flowcharts of FIGS. 22-24. In accordance withthe second embodiment of the present invention, the application programexecution process is identical to the process of the first embodimentdiscussed with reference to FIG. 14, and is not further describedherein.

A temperature information management process of the master apparatus isdescribed below with reference to the flowchart of FIG. 22.

In step S71, the temperature information acquisition unit 164 determineswhether a timer interrupt has been issued from the interrupt controller165.

If it is determined in step S71 that no timer interrupt has been issued,the temperature management information transmission and receptioncontroller 214 determines in step S72 whether a temperature managementtable has been received from any of the information processingapparatuses 101 connected to the network 2. If it is determined in stepS72 that no temperature management table has been received, processingreturns to step S71 to repeat step S71 and subsequent steps. If it isdetermined in step S72 that a temperature management table has beenreceived, processing proceeds to step S74.

If it is determined in step S71 that a timer interrupt has beenreceived, the temperature information acquisition unit 164 acquirestemperature detection results from each temperature detector 121 in stepS73.

If it is determined in step S72 that a temperature management table hasbeen received, or subsequent to step S73, the temperature informationacquisition unit 164 updates, in step S74, the temperature managementtable 215 based on the temperature management table of the otherinformation processing apparatus 101 received in step S72, or owntemperature management table acquired in step S73.

In step S75, the temperature rise detector 168 references thetemperature management table 215 to determine whether a temperatureanomaly is contained in the temperature information, in other words,whether any of the temperature detection results of all temperaturedetectors 121 arranged in the information processing apparatuses 101connected to the network 2 is above the predetermined temperature upperlimit. If it is determined in step S75 that no abnormal temperaturevalue is contained in the temperature information, processing returns tostep S71 to repeat step S71 and subsequent steps.

If it is determined in step S75 that an abnormal temperature value iscontained in the temperature information, the temperature rise detector168 notifies the interrupt controller 165 of the detection of anabnormal temperature rise, thereby causing the interrupt controller 165to interrupt the arithmetic processor 161 and the temperature anomalycorrection controller 216 in step S76. The interrupt controller 165interrupts the arithmetic processor 161 and the temperature anomalycorrection controller 216, thereby causing the arithmetic processor 161to stop the process of the application program and the temperatureanomaly correction controller 216 to start an anomaly-time process 2.

The anomaly-time process 2 to be discussed later with reference to FIG.23 is performed in step S77.

In step S78, the temperature anomaly correction controller 216 controlsthe logical thread management processor 217 in accordance with theanomaly-time process 2 executed in step S77, thereby causing thetemperature anomaly correction controller 216 to update a table forthread management as necessary.

In step S79, the interrupt controller 165 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S71 to repeat step S71 andsubsequent steps.

The master information processing apparatus 101 acquires the temperaturemanagement table updated based on the temperature information detectedby each temperature detector 121 arranged in each of the informationprocessing apparatuses 101 connected to the network 2, and manages thetable as the temperature management table 215. Whether to perform ananomaly-time interrupt process is thus determined based on thetemperature management table 215 stored in the master informationprocessing apparatus 101.

The anomaly-time process 2 executed in step S77 of FIG. 22 is describedbelow with reference to a flowchart of FIG. 23.

In step S91, the temperature anomaly correction controller 216references the temperature management table 215 to determine which ofthe main processor 42 and the information processing controller 111 inany of the information processing apparatuses 101 connected to thenetwork 2 suffers from a temperature anomaly. If it is determined instep S91 that one of the main processor 42 and the informationprocessing controller 111 in any of the information processingapparatuses 101 connected to the network 2 suffers a temperatureanomaly, processing proceeds to step S103.

If it is determined in step S91 that none of the main processor 42 andthe information processing controller 111 suffers from the temperatureanomaly, in other words that any of the sub-processors 43 in any of theinformation processing apparatuses 101 connected to the network 2suffers from the temperature anomaly, the temperature anomaly correctioncontroller 216 references the temperature management table 215 in stepS92. The temperature anomaly correction controller 216 determines instep S92 whether the process of the sub-processor 43 detected to be intemperature anomaly is transferable, in other words, whether any of thesub-processors 43 other than the sub-processor 43 detected to be intemperature anomaly is inoperative. If it is determined in step S92 thatthe process of the sub-processor 43 detected to be in temperatureanomaly is not transferable, processing proceeds to step S97.

If it is determined in step S92 that the process of the sub-processor 43detected to be in temperature anomaly is transferable, the temperatureanomaly correction controller 216 references the temperature managementtable 215 in step S93. In step S93, the temperature anomaly correctioncontroller 216 thus selects a sub-processor 43 as a transfer target ofthe process from among the sub-processors 43 of the informationprocessing controllers 111 of the information processing apparatuses 101connected to the network 2, and notifies the logical thread managementprocessor 217 of the selection results. More specifically, thetemperature anomaly correction controller 216 selects, as a transfertarget with priority, one sub-processor 43 resulting in the lowesttemperature measurement from among those that have remained inoperativeand are not closely located to the currently operating sub-processor 43,from among the sub-processors 43 of the information processingcontrollers 111 of the information processing apparatuses 101 connectedto the network 2. If a plurality of sub-processors 43 satisfy thecriteria, the temperature anomaly correction controller 216 selects asub-processor 43 having the smallest sub-processor ID number as atransfer target. If sub-processors 43 that have remained inoperative andare located far from the currently operating sub-processor 43 are notavailable, the temperature anomaly correction controller 216 selects oneresulting in the lowest temperature measurement from among the currentlyinoperative sub-processors 43 out of the sub-processors 43 of theinformation processing controllers 111 of the information processingapparatuses 101 connected to the network 2. If a plurality ofsub-processors 43 satisfy the criteria, the temperature anomalycorrection controller 216 selects a sub-processor 43 having the smallestsub-processor ID number as a transfer target, and notifies the logicalthread management processor 217 of the selection results.

In step S94, the logical thread management processor 217 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit.

If the sub-processor 43 detected to be above the temperature upper limitis in a master apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 217 (a portion of the storage areaof the local storage 51 of the main processor 42). If the sub-processor43 does not pre-store commonly used program and model data, the threadtransfer and interchange processor 186 transfers the data of the codearea 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 217 (the portion ofthe storage area of the local storage 51 of the main processor 42).

If the sub-processor 43 detected to be above the temperature upper limitis in a slave apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 217 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 101 via the bus 41, the bus 14, the communicationunit 16 and the network 2. If the sub-processor 43 does not pre-storecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 217 (the portion of the storagearea of the local storage 51 of the main processor 42) in theinformation processing apparatus 101 via the bus 41, the bus 14, thecommunication unit 16 and the network 2.

In step S95, the logical thread management processor 217 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S96, the logical thread management processor 217 restores thecontext, evacuated in step S94, to the sub-processor 43 selected as atransfer target sub-processor. More specifically, if the transfer targetsub-processor 43 is the one in the master apparatus, the logical threadmanagement processor 217 supplies the context stored in an informationstorage area managed by itself to the transfer target sub-processor 43via the bus 41. If the transfer target sub-processor 43 is the one inthe slave apparatus, the logical thread management processor 217supplies the context stored in the information storage area manageditself to the transfer target sub-processor 43 contained in theinformation processing apparatus 101 functioning as a slave apparatus,via the bus 41, the bus 14, the communication unit 16 and the network 2.The sub-processor 43 selected as the transfer target sub-processorstores the supplied context in corresponding areas of the code area 187through the stack area 190. Processing returns to step S77 and thenproceeds to step S78 as shown in FIG. 22.

If it is determined in step S92 that the process of the sub-processor 43detected to be in temperature anomaly is not transferable, thetemperature anomaly correction controller 216 references the temperaturemanagement table 215 in step S97. In step S97, the temperature anomalycorrection controller 216 selects a sub-processor 43 as an interchangetarget from among the sub-processors 43 of the information processingcontrollers 111 of the information processing apparatuses 101 connectedto the network 2, and notifies the logical thread management processor217 of the selection results. More specifically, the temperature anomalycorrection controller 216 selects, as a transfer target sub-processor 43with priority, one resulting in the lowest temperature measurement fromamong the sub-processors 43 of the information processing controllers111 of the information processing apparatuses 101 connected to thenetwork 2. If a plurality of sub-processors 43 satisfy the criteria, thetemperature anomaly correction controller 216 selects a sub-processor 43having the smallest sub-processor ID as a transfer target.

In step S98, the logical thread management processor 217 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit.

If the sub-processor 43 detected to be above the temperature upper limitis a master apparatus, the interrupt controller 185 stops the process ofthe arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 217 (a portion of the storage areaof the local storage 51 of the main processor 42). If the sub-processor43 does not pre-store commonly used program and model data, the threadtransfer and interchange processor 186 transfers the data of the codearea 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 217 (the portion ofthe storage area of the local storage 51 of the main processor 42).

If the sub-processor 43 detected to be above the temperature upper limitis in a slave apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 as the interchange target pre-storesthe commonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 217 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 101 functioning as a master apparatus via the bus41, the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area managed by the logical thread management processor 217 (theportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 101 functioning asthe master apparatus via the bus 41, the bus 14, the communication unit16 and the network 2.

In step S99, the logical thread management processor 217 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S100, the logical thread management processor 217 evacuates thecontext of the process being executed by the sub-processor 43 selectedas the interchange target.

If the sub-processor 43 selected as the interchange target is in amaster apparatus, the interrupt controller 185 suspends the process ofthe arithmetic processor 181 in response to an interrupt command toevacuate the currently processed context. The thread transfer andinterchange processor 186 evacuates the context of the currentlyexecuted program (the values of the register 182, the floating-pointregister 183, and the program counter 184) to the stack area 190. If thesub-processor 43 as the transfer source pre-stores the commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the content of the stack area 190 and the data area 189 toan information storage area managed by the logical thread managementprocessor 217 (a portion of the storage area of the local storage 51 ofthe main processor 42). If the sub-processor 43 does not pre-storecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 217 (the portion of the storagearea of the local storage 51 of the main processor 42).

If the sub-processor 43 selected as the interchange target of theprocess is in a slave apparatus, the interrupt controller 185 stops theprocess of the arithmetic processor 181 in response to an interruptcommand instructing the evacuation of the context of the currentprocess. The thread transfer and interchange processor 186 evacuates thecontext of the currently running program (the values of the register182, the floating-point register 183, and the program counter 184) tothe stack area 190. If the sub-processor 43 as the transfer sourcepre-stores the commonly used program and model data, the thread transferand interchange processor 186 transfers the content of the stack area190 and the data area 189 to an information storage area managed by thelogical thread management processor 217 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 101 operating as a master apparatus via the bus 41,the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area managed by the logical thread management processor 217 (theportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 101 operating asthe master apparatus via the bus 41, the bus 14, the communication unit16 and the network 2.

In step S101, the logical thread management processor 217 stops theoperation of the sub-processor 43 selected as the interchange target.

In step S102, the logical thread management processor 163 interchangescontexts between the two context-evacuated sub-processors 43 to restorethe context there. More specifically, the logical thread managementprocessor 163 restores the context, evacuated in step S98, to thesub-processor 43 selected as the interchange target of the process whilerestoring the context, evacuated in step S100, to the sub-processor 43detected to be above the temperature upper limit. If the sub-processor43 detected to be above the temperature upper limit or the interchangetarget sub-processor 43 is the one in the master apparatus, the logicalthread management processor 217 supplies the corresponding contextstored in the information storage area managed by itself to theinterchange target sub-processor 43 via the bus 41. If the sub-processor43 detected to be above the temperature upper limit or the interchangetarget sub-processor 43 is the one in the slave apparatus, the logicalthread management processor 217 supplies the corresponding contextstored in the information storage area managed by itself to theinterchange target sub-processor 43 contained in the informationprocessing apparatus 101 operating as the slave apparatus via the bus41, the bus 14, the communication unit 16 and the network 2. Eachsub-processor 43 stores the supplied context in areas of the code area187 through the stack area 190. Processing returns to step S77 and thenproceeds to step S78 of FIG. 22.

If it is determined in step S91 that one of the main processor 42 andthe information processing controller 111 suffers from the temperatureanomaly, the temperature anomaly correction controller 216 determines instep S103 whether one of the main processor 42 and the informationprocessing controller 111, suffering from the temperature anomaly, iscontained in the information processing apparatus 101 as the masterapparatus. If it is determined in step S103 that one of the mainprocessor 42 and the information processing controller 111 sufferingfrom the temperature anomaly is contained in the information processingapparatus 101 as the master apparatus, processing proceeds to step S106.

If it is determined in step S103 that one of the main processor 42 andthe information processing controller 111, suffering from thetemperature anomaly, is not contained in the information processingapparatus 101 as the master apparatus, in other words, one of the mainprocessor 42 and the information processing controller 111, sufferingfrom the temperature anomaly, is contained in the information processingapparatus 101 as the salve apparatus, the temperature anomaly correctioncontroller 216 references the temperature management table 215 in stepS104. In step S104, the temperature anomaly correction controller 216thus determines whether the process of one of the main processor 42 andthe information processing controller 111 in the information processingapparatus 101 is transferable. If it is determined in step S104 that theprocess of one of the main processor 42 and the information processingcontroller 111 in the information processing apparatus 101 istransferable, processing proceeds to step S93.

If it is determined in step S104 that the process of one of the mainprocessor 42 and the information processing controller 111 in theinformation processing apparatus 101 is not transferable, thetemperature anomaly correction controller 216 references the temperaturemanagement table 215 in step S105. In step S105, the temperature anomalycorrection controller 216 determines the process of one of the mainprocessor 42 and the information processing controller 111 in theinformation processing apparatus 101 is interchangeable. If it isdetermined in step S105 that the process of one of the main processor 42and the information processing controller 111 in the informationprocessing apparatus 101 is interchangeable, processing proceeds to stepS97.

If it is determined in step S103 that the one of the main processor 42and the information processing controller 111, detected to be intemperature anomaly, is contained in the information processingapparatus 101 as the master apparatus, or if it is determined in stepS105 that the process of one of the main processor 42 and theinformation processing controller 111 in the information processingapparatus 101 is not interchangeable, the temperature anomaly correctioncontroller 216 controls the logical thread management processor 217 totemporarily stop the application program executed by the arithmeticprocessor 161. The process of the main processor 42, except part thereofexecuted by the resident program, is temporarily suspended.

In step S107, the temperature anomaly correction controller 216references the temperature management table 215 to determine whether anormal temperature state is restored. If it is determined in step S107that normal temperature state is not yet restored, the process in stepS107 is repeated until it is determined that the normal temperaturestate is restored. If it is determined in step S107 that the normaltemperature state is restored, processing returns to step S77 and thenproceeds to step S78 as shown in FIG. 22.

In this way, whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined depending on the location of thetemperature anomaly, the operation of the chip, and the temperaturemeasurement values of the processors. One of the transfer target and theinterchange target is also determined.

A temperature information management process of the slave apparatusexecuted in parallel with the temperature information management processof the master apparatus discussed with reference to FIG. 22 is describedbelow with reference to a flowchart of FIG. 24.

In step S121, the temperature information acquisition unit 164 in theinformation processing apparatus 101 functioning as a slave apparatusdetermines whether a timer interrupt has been input. If it is determinedin step S121 that no timer interrupt has been input, the process in stepS121 is repeated until it is determined that a timer interrupt has beeninput.

If it is determined in step S121 that a timer interrupt has been input,the temperature information acquisition unit 164 acquires thetemperature information from each of the temperature detectors 121 instep S122.

In step S123, the temperature information acquisition unit 164 updatesthe temperature management table 215 based on the temperatureinformation acquired in step S122.

In step S124, the temperature management information transmission andreception controller 214 transmits the temperature management table 215,updated in step S123, to the information processing apparatus 101functioning as the master apparatus via the communication unit 16 andthe network 2. Processing returns to step S121 to repeat step S121 andsubsequent steps.

The temperature management table of the slave apparatus is transmittedto the master apparatus. The transmitted temperature management table ofthe slave apparatus is managed by the master apparatus.

In accordance with the second embodiment of the present invention, theplurality of information processing apparatuses 101 connected to thenetwork 2, each having the information processing controller 111 withthe temperature detectors 121 arranged at the main processor 42 and thesub-processors 43 respectively, perform the process as discussed withreference to FIGS. 21-24. With the first pattern control of thetemperature information and the transfer or interchange of the process,device failure or lowered processing speed due to heat is preventedwhile the suspension of the process in the middle thereof is minimized.

FIG. 25 is a functional block diagram illustrating the informationprocessing controller 111 that performs control in the second pattern inaccordance with the second embodiment of the present invention. Elementsidentical to those discussed with reference to FIG. 21 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the information processing controller 111 of FIG. 25performing the second pattern control in accordance with the secondembodiment of the present invention, a memory 231, a temperaturemanagement information transmission and reception controller 232, and atemperature anomaly correction controller 234 are used in place of thememory 213, the temperature management information transmission andreception controller 214, and the temperature anomaly correctioncontroller 216, respectively. The rest of the main processor 42 isidentical to the main processor 42 of FIG. 21. The temperaturemonitoring processor 122 uses a temperature management table 233 inplace of the temperature management table 215. The rest of thetemperature monitoring processor 122 is identical to the temperaturemonitoring processor 122 of FIG. 21.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 25. For example, part of the functionof the main processor 42 may be carried out by the temperaturemonitoring processor 122, part of the function of the temperaturemonitoring processor 122 may be performed by the main processor 42, orthese functions may be performed by different hardware. Even in such acase, the present invention is perfectly applicable.

The memory 231 corresponds to at least part of the storage area of themain memory 12, stores at least part of the device information of theinformation processing apparatus 101 connected to the network 2 whilestoring temporarily the temperature management table of anotherinformation processing apparatus 101, received by the temperaturemanagement information transmission and reception controller 232. Underthe control of the temperature anomaly correction controller 234, thetemperature management information transmission and reception controller232 controls transmitting, via the 16, the temperature managementinformation or a variety of commands (software cell) generated fortemperature management to the other information processing apparatus 101connected to the network 2. The temperature management informationtransmission and reception controller 232 also controls receiving, viathe communication unit 16, the temperature management information or avariety of commands (software cell) for temperature management from theother information processing apparatus 101 connected to the network 2.

If the temperature rise detector 168 detects the occurrence of atemperature anomaly, and the interrupt controller 165 performs aninterrupt process, the temperature anomaly correction controller 234generates a command requesting all other information processingapparatuses 101 connected to the network 2 to transmit the temperaturemanagement information, based on the information acquired by owntemperature information acquisition unit 164. The temperature anomalycorrection controller 234 also controls the temperature managementinformation transmission and reception controller 232 to transmit thegenerated command to all other information processing apparatuses 101.When the temperature management information transmission and receptioncontroller 232 receives, from the other information processing apparatus101 connected to the network 2, a command requesting the transmission ofthe temperature management information, the temperature anomalycorrection controller 234 generates a temperature information replycommand of FIG. 26 based on the temperature management table stored inthe temperature management table 233. The temperature anomaly correctioncontroller 234 controls the temperature management informationtransmission and reception controller 232 to transmit the generatedtemperature information reply command.

The temperature information reply command contains, from the temperaturemanagement table information stored in the temperature management table233, updated temperature detection results of the heat sink 141, themain processor 42, and the sub-processor 43-1 through the sub-processor43-8 (namely, updated temperature measurement results of the temperaturedetector 121-1 through the temperature detector. 121-10), the settemperature upper limits of the heat sink 141, the main processor 42,and the sub-processor 43-1 through the sub-processor 43-8 (in otherwords, a temperature anomaly is triggered if any of the temperaturedetector 121-1 through the temperature detector 121-10 detects atemperature above the set temperature upper limit), information of theoperation states of the sub-processor 43-1 through the main processor42-8, and layout information of the sub-processors in the chip.

Regardless of whether own apparatus is a master apparatus or a slaveapparatus, the temperature management table 233 stores own temperaturemanagement table updated based on the information acquired from owntemperature information acquisition unit 164.

The second pattern operation of the second embodiment is described belowwith reference to flowcharts of FIGS. 27 and 28. In accordance with thesecond embodiment, the application program execution process isbasically identical to the application program execution process of thefirst embodiment discussed with reference to FIG. 14, and the discussionthereof is omitted herein.

A temperature information management process 2 is described below withreference to a flowchart of FIG. 27.

In steps S141 through S144, a process basically similar to thatdiscussed with reference to steps S21 through S24 of FIG. 15 isperformed. More specifically, if it is determined that a timer interrupthas been received, the temperature information acquisition unit 164acquires temperature information from each of the temperature detectors121, and updates the temperature management table 233. The temperaturerise detector 168 references the temperature management table 233 todetermine whether an abnormal value is contained in the temperatureinformation.

If it is determined in step S144 that no abnormal value is contained inthe temperature information, the temperature anomaly correctioncontroller 234 determines in step S145 whether the temperaturemanagement information transmission and reception controller 232 hasreceived, from another information processing apparatus 101 connected tothe network 2, a command requesting the transmission of the temperaturemanagement information. If it is determined in step S145 that thetemperature management information transmission and reception controller232 has not received, from the other information processing apparatus101 connected to the network 2, a command requesting the transmission ofthe temperature management information, processing returns to step S141to repeat step S141 and subsequent steps.

If it is determined in step S145 that a command requesting thetransmission of the temperature management information has been receivedfrom the other information processing apparatus 101, the temperatureanomaly correction controller 234 generates the temperature informationreply command of FIG. 26 based on the temperature management tablestored in the temperature management table 233 in step S146. Thetemperature anomaly correction controller 234 controls the temperaturemanagement information transmission and reception controller 232 totransmit the generated temperature information reply command. Processingreturns to step S141 to repeat step S141 and subsequent steps.

If it is determined in step S144 that an abnormal value is contained inthe temperature information, the temperature rise detector 168 notifiesthe interrupt controller 165 of the detection of the abnormaltemperature rise, thereby causing the interrupt controller 165 tointerrupt the arithmetic processor 161 and the temperature anomalycorrection controller 234 in step S147. The interrupt controller 165interrupts the arithmetic processor 161 and the temperature anomalycorrection controller 234, thereby stopping the process of theapplication program controlled by the arithmetic processor 161 andcausing the temperature anomaly correction controller 234 to start ananomaly-time process 3.

The anomaly-time process 3 to be discussed later with reference to FIG.28 is executed in step S148.

In step S149, the temperature anomaly correction controller 234 controlsthe logical thread management processor 217 based on the anomaly-timeprocess 3 executed in step S148, thereby updating the table of thelogical thread management as necessary.

In step S150, the interrupt controller 165 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S141 to repeat step S141and subsequent steps.

Regardless of whether each information processing apparatus 101connected to the network 2 is a master apparatus or a slave apparatus, atemperature anomaly of own apparatus is detected based on thetemperature management table updated based on the temperatureinformation detected by the temperature detectors 121 of own apparatus.In the event of the anomaly, the interrupt process is performed and theanomaly-time process 3 to be discussed later is performed. If therequest to transmit the temperature information is received from theother information processing apparatus 101 connected to the network 2,the temperature information reply command of FIG. 26 is generated, andthen transmitted to the requesting information processing apparatus 101.

The anomaly-time process 3 executed in step S148 of FIG. 27 is describedbelow with reference to a flowchart of FIG. 28.

In step S181, the temperature anomaly correction controller 234references the temperature management table 233, and determines which ofthe main processor 42 and the information processing controller 111suffers from the temperature anomaly, in other words, which of thetemperature detector 121-9 and the temperature detector 121-10 hasdetected temperatures above the predetermined temperature upper limit.If it is determined in step S181 that one of the main processor 42 andthe information processing controller 11 causes the temperature anomaly,processing proceeds to step S195 as described below.

If it is determined in step S181 that neither the main processor 42 northe information processing controller 111 causes the temperatureanomaly, in other words, that any of the sub-processors 43 has causedthe temperature anomaly, the temperature anomaly correction controller234 generates a command requesting all other information processingapparatuses 101 connected to the network 2 to transmit the temperaturemanagement information in step S182. The temperature anomaly correctioncontroller 234 controls the temperature management informationtransmission and reception controller 232 to transmit the generatedcommand. The temperature management information transmission andreception controller 232 transmits, via the communication unit 16 andthe network 2, the command requesting the transmission of thetemperature management information to all information processingapparatuses 101 connected to the network 2.

In step S183, the temperature management information transmission andreception controller 232 receives the temperature information replycommand of FIG. 26 and supplies the received temperature informationreply command to the temperature anomaly correction controller 234.

In step S184, the temperature anomaly correction controller 234determines, based on the temperature information reply commandtransmitted from all other information processing apparatuses 101connected to the network 2, whether the process of the sub-processor 43detected to be in temperature anomaly is transferable.

If it is determined in step S184 that the process is transferable, aprocess basically identical to that performed in steps S93 through S96of FIG. 23 is performed in steps S185 through S188. More specifically,the temperature management table 233 is referenced, a transfer targetsub-processor 43 is selected from among the sub-processors 43 of theinformation processing controller 111 in the information processingapparatus 101 connected to the network 2, the context of the processbeing executed by the sub-processor 43 detected to be above thetemperature upper limit is evacuated, the operation of the sub-processor43 detected to be above the temperature upper limit is stopped, and theevacuated context is restored back to the transfer target sub-processor.

Subsequent to step S188, processing returns to step S148 and proceeds tostep S149 of FIG. 27.

If it is determined in step S184 that the process is not transferable, aprocess basically identical to that performed in steps S97 through S102of FIG. 23 is performed in steps S189 through S194. More specifically,the temperature management table 233 is referenced, an interchangetarget sub-processor 43 is selected from among the sub-processors 43 ofthe information processing controller 111 in the information processingapparatus 101 connected to the network 2, the context of the processbeing executed by the sub-processor 43 detected to be above thetemperature upper limit is evacuated, and the operation of thesub-processor 43 detected to be above the temperature upper limit isstopped.

The context of the process being executed by the sub-processor 43selected as the interchange target of the process is evacuated, theoperation of the sub-processor 43 selected as the interchange target ofthe process is stopped, and the contexts of the two sub-processors areinterchanged for restoration.

Subsequent to step S194, processing returns to step S148 and thenproceeds to step S149.

If it is determined in step S181 that one of the main processor 42 andthe information processing controller 11 suffers from the temperatureanomaly, a process basically identical to that performed in steps S53and S54 of FIG. 16 is performed in steps S195 and S196. Morespecifically, the logical thread management processor 217 is controlledso that the application program being executed by the arithmeticprocessor 161 is temporarily stopped. The process of the main processor42, except part of thereof under the control of the resident program, istemporarily stopped. The temperature management table 233 is referencedto determine whether normal temperature state is restored. If it isdetermined that the normal temperature state has not been restored, theprocess in step S196 is repeated until it is determined that the normaltemperature state is restored.

If it is determined in step S196 that the normal temperature state hasbeen restored, processing returns to step S148 and then proceeds to stepS149.

In this way, if a temperature anomaly occurs, another informationprocessing apparatus is requested to transmit the temperatureinformation. Whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined depending on the location of thetemperature anomaly, the operation of the information processingcontroller 111 connected to the network 2, and the temperaturemeasurement values of the processors. One of the transfer target and theinterchange target is also determined.

In accordance with the second embodiment of the present invention, theplurality of information processing apparatuses 101 connected to thenetwork 2, each having the information processing controller 111 withthe temperature detectors 121 arranged at the main processor 42 and thesub-processors 43 respectively, perform the process as discussed withreference to FIGS. 25-28. With the second pattern control of thetemperature information and the transfer or interchange of the process,device failure or lowered processing speed due to heat is preventedwhile the suspension of the process in the middle thereof is minimized.

FIG. 29 is a functional block diagram illustrating the informationprocessing controller 111 that performs control in the third pattern inaccordance with the second embodiment of the present invention. Elementsidentical to those discussed with reference to FIG. 21 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the information processing controller 111 of FIG. 29performing the third pattern control in accordance with the secondembodiment of the present invention, a temperature managementinformation transmission and reception controller 251 and a temperatureanomaly correction controller 252 are used in place of the temperaturemanagement information transmission and reception controller 214, andthe temperature anomaly correction controller 216, respectively. Therest of the main processor 42 is identical to the main processor 42 ofFIG. 21. The temperature monitoring processor 122 uses a temperaturemanagement table 233 in place of the temperature management table 215.The rest of the temperature monitoring processor 122 is identical to thetemperature monitoring processor 122 of FIG. 21.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 29. For example, part of the functionof the main processor 42 may be carried out by the temperaturemonitoring processor 122, part of the function of the temperaturemonitoring processor 122 may be performed by the main processor 42, orthese functions may be performed by different hardware. Even in such acase, the present invention is perfectly applicable.

Under the control of the temperature anomaly correction controller 252,the temperature management information transmission and receptioncontroller 251 controls transmitting, via the 16, the temperaturemanagement information or a variety of commands (software cell)generated for temperature management to the other information processingapparatus 101 connected to the network 2. The temperature managementinformation transmission and reception controller 251 also controlsreceiving, via the communication unit 16, the temperature managementinformation or a variety of commands (software cell) for temperaturemanagement from the other information processing apparatus 101 connectedto the network 2.

If the temperature rise detector 168 detects the occurrence of atemperature anomaly, and the interrupt controller 165 performs aninterrupt process, the temperature anomaly correction controller 252generates a sub-processor program transfer command of FIG. 30 to requestall other information processing apparatuses 101 connected to thenetwork 2 to transfer or interchange the process of a current logicalthread, based on the information acquired by the temperature informationacquisition unit 164 of own apparatus. The temperature anomalycorrection controller 252 also controls the temperature managementinformation transmission and reception controller 251 to transmit thegenerated command. When the temperature management informationtransmission and reception controller 251 receives, from the otherinformation processing apparatus 101 connected to the network 2, thesub-processor program transfer request command of FIG. 30, thetemperature anomaly correction controller 251 generates a sub-processorprogram transfer reply command of FIG. 31 based on a temperaturemanagement table stored in the temperature management table 233. Thetemperature anomaly correction controller 252 controls the temperaturemanagement information transmission and reception controller 251 totransmit the generated sub-processor program transfer reply command.

The sub-processor program transfer request command contains informationof a sub-processor usage ratio of the process (thread) being executed bythe sub-processor detected to be in temperature anomaly, and a localstorage capacity of the sub-processor detected to be in temperatureanomaly.

The sub-processor program transfer reply command contains informationrelating to whether to accept the transfer request of the sub-processorprogram (transfer OK, interchange OK, or transfer/interchangeunpermissible), and a sub-processor ID if the correspondingsub-processor accepts the sub-processor program transfer request. Thetemperature anomaly correction controller 252 determines whether toaccept the sub-processor program transfer request, whether to accept thesub-processor program interchange request, or whether to reject the tworequests, based on the sub-processor usage ratio of the sub-processordetected to be in temperature anomaly and performing the process(thread) thereof, and information of the local storage capacity,described in the sub-processor program transfer request command, and thetemperature management table stored in the temperature management table233.

Regardless of whether own apparatus is a master apparatus or a slaveapparatus, as previously discussed with reference to FIG. 25, thetemperature management table 233 holds own temperature management tableupdated based on the information acquired by the temperature informationacquisition unit 164.

The operation of the third pattern of the second embodiment is describedbelow with reference to flowcharts of FIGS. 32 and 33. The applicationprogram execution process of the second embodiment is basicallyidentical to the application program execution process of the firstembodiment discussed with reference to FIG. 14, and the discussionthereof is omitted herein.

A temperature information management process 3 is described below withreference to the flowchart of FIG. 32.

A process substantially identical to that performed in steps S21 throughS24 of FIG. 15 is performed in steps S211 through S214. Morespecifically, if it is determined that a timer interrupt has beenreceived, the temperature information acquisition unit 164 acquirestemperature information from each of the temperature detectors 121, andupdates the temperature management table 233. The temperature risedetector 168 references the temperature management table 233 todetermine whether an abnormal value is contained in the temperatureinformation.

If it is determined in step S214 that no abnormal value is contained inthe temperature information, the temperature anomaly correctioncontroller 252 determines in step S215 whether the temperaturemanagement information transmission and reception controller 251 hasreceived, from another information processing apparatus 101 connected tothe network 2, a sub-processor program transfer request command of FIG.30. If it is determined in step S215 that the temperature managementinformation transmission and reception controller 232 has not received,from the other information processing apparatus 101, the sub-processorprogram transfer request command, processing returns to step S211 torepeat step S211 and subsequent steps.

If it is determined in step S215 that the sub-processor program transferrequest has been received from the other information processingapparatus 101, the temperature anomaly correction controller 252determines whether to accept the sub-processor program transfer request.This determination is performed based on information described in thesub-processor program transfer request command, including thesub-processor usage ratio of the sub-processor, detected to be intemperature anomaly, performing the process (thread), information of thelocal storage capacity, and information regarding the operation statesof the sub-processor 43-1 through the sub-processor 43-8 of ownapparatus, updated temperature measurement results of the heat sink 141,the main processor 42 and the sub-processor 43-1 through thesub-processor 43-8, and the sub-processor layout information stored inthe temperature management table 233. The temperature anomaly correctioncontroller 252 generates the temperature information reply command ofFIG. 31, and controls the temperature management informationtransmission and reception controller 251 to transmit the generatedtemperature information reply command. Processing returns to step S211to repeat step S211 and subsequent steps.

If it is determined in step S214 that an abnormal value is contained inthe temperature information, the temperature rise detector 168 notifiesthe interrupt controller 165 of the detection of the abnormaltemperature rise, thereby causing the interrupt controller 165 tointerrupt the arithmetic processor 161 and the temperature anomalycorrection controller 252 in step S217. The interrupt controller 165interrupts the arithmetic processor 161 and the temperature anomalycorrection controller 252, thereby stopping the process of theapplication program controlled by the arithmetic processor 161 andcausing the temperature anomaly correction controller 252 to start ananomaly-time process 4.

The anomaly-time process 4 to be discussed later with reference to FIG.33 is executed in step S218.

In step S219, the temperature anomaly correction controller 252 controlsthe logical thread management processor 217 based on the anomaly-timeprocess 4 executed in step S218, thereby updating the table of thelogical thread management as necessary.

In step S220, the interrupt controller 165 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S211 to repeat step S211and subsequent steps.

Regardless of whether each information processing apparatus 101connected to the network 2 is a master apparatus or a slave apparatus, atemperature anomaly of own apparatus is detected based on thetemperature management table updated based on the temperatureinformation detected by the temperature detectors 121 of own apparatus.In the event of the anomaly, the interrupt process is performed and theanomaly-time process 4 to be discussed later is performed. If thesub-processor program transfer request command of FIG. 30 is receivedfrom the other information processing apparatus 101 connected to thenetwork 2, a temperature information reply command of FIG. 31 isgenerated, and then transmitted to the requesting information processingapparatus 101.

The anomaly-time process 4 executed in step S218 of FIG. 32 is describedbelow with reference to a flowchart of FIG. 33.

In step S231, the temperature anomaly correction controller 252references the temperature management table 233, and determines which ofthe main processor 42 and the information processing controller 111suffers from the temperature anomaly, in other words, which of thetemperature detector 121-9 and the temperature detector 121-10 hasdetected temperatures above the predetermined temperature upper limit.If it is determined in step S231 that one of the main processor 42 andthe information processing controller 11 causes the temperature anomaly,processing proceeds to step S245 as described below.

If it is determined in step S231 that neither the main processor 42 northe information processing controller 111 causes the temperatureanomaly, in other words, that one of the sub-processors 43 has causedthe temperature anomaly, the temperature anomaly correction controller252 generates the sub-processor program transfer request command of FIG.30 in step S232. The temperature anomaly correction controller 252causes the temperature management information transmission and receptioncontroller 251 to transmit the generated command to all otherinformation processing apparatuses 101 connected to the network 2. Thetemperature management information transmission and reception controller251 transmits, via the communication unit 16 and the network 2, thesub-processor program transfer request command to all informationprocessing apparatuses 101 connected to the network 2.

In step S233, the temperature management information transmission andreception controller 262 receives the sub-processor program transferrequest command of FIG. 30 and supplies the received sub-processorprogram transfer request command to the temperature anomaly correctioncontroller 252.

In step S234, the temperature anomaly correction controller 251determines, based on the sub-processor program transfer request commandreceived in step S233, whether the process of the sub-processor 43detected to be in temperature anomaly is transferable.

If it is determined in step S234 that the process is transferable, aprocess basically identical to that performed in steps S93 through S96of FIG. 23 is performed in steps S235 through S238. More specifically,the temperature management table 233 is referenced, one transfer targetsub-processor 43 is selected as a transfer target from among thesub-processors 43 of the information processing controller 111 in theinformation processing apparatus 101 connected to the network 2, thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit is evacuated, the operation ofthe sub-processor 43 detected to be above the temperature upper limit isstopped, and the evacuated context is restored back to the transfertarget sub-processor 43.

Subsequent to step S238, processing returns to step S218 and proceeds tostep S219 of FIG. 32.

If it is determined in step S234 that the process is not transferable, aprocess basically identical to that performed in steps S97 through S102of FIG. 23 is performed in steps S239 through S244. More specifically,the temperature management table 233 is referenced, one sub-processor 43is selected as an interchange target from among the sub-processors 43 ofthe information processing controller 111 in the information processingapparatus 101 connected to the network 2, the context of the processbeing executed by the sub-processor 43 detected to be above thetemperature upper limit is evacuated, and the operation of thesub-processor 43 detected to be above the temperature upper limit isstopped.

The context of the process being executed by the sub-processor 43selected as the interchange target of the process is evacuated, theoperation of the sub-processor 43 selected as the interchange target ofthe process is stopped, and the contexts of the two sub-processors areinterchanged for restoration.

Subsequent to step S244, processing returns to step S218 and proceeds tostep S219 of FIG. 32.

If it is determined in step S231 that one of the main processor 42 andthe information processing controller 11 suffers from the temperatureanomaly, a process basically identical to that performed in steps S53and S54 of FIG. 16 is performed in steps S245 and S246. Morespecifically, the logical thread management processor 217 is controlledso that the application program being executed by the arithmeticprocessor 161 is temporarily stopped. The process of the main processor42, except part of thereof under the control of the resident program, istemporarily stopped. The temperature management table 233 is referencedto determine whether normal temperature state is restored. If it isdetermined that the normal temperature state has not been restored, theprocess in step S246 is repeated until it is determined that the normaltemperature state is restored.

If it is determined in step S246 that the normal temperature state hasbeen restored, processing returns to step S218 and then proceeds to stepS219 of FIG. 32.

In this way, if a temperature anomaly occurs, the sub-processor programtransfer request command is transmitted, and the reply command isreceived. Whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined depending on the location of thetemperature anomaly, the operation of the information processingcontroller 111 connected to the network 2, and the temperaturemeasurement values of the processors. One of the transfer target and theinterchange target is also determined.

In accordance with the second embodiment of the present invention, theplurality of information processing apparatuses 101 connected to thenetwork 2, each having the information processing controller 111 withthe temperature detectors 121 arranged at the main processor 42 and thesub-processors 43 respectively, perform the process as discussed withreference to FIGS. 29-33. With the third pattern control of thetemperature information and the transfer or interchange of the process,device failure or lowered processing speed due to heat is preventedwhile the suspension of the process in the middle thereof is minimized.

An information processing apparatus 281-1 can include a plurality ofinformation processing controllers 111-1 through 111-p (p is a positiveinteger) as shown in FIG. 34. In such a case, as well, the informationprocessing apparatus 281-1 transmits and receives, via the bus 14, avariety of information units, as in the second embodiment where thevariety of information units is transmitted and received by theplurality of information processing controllers 111 via thecommunication unit 16 and the network 2. The present invention is alsoapplicable to such an arrangement.

One of the information processing controllers 111-1 through 111-p in theinformation processing apparatus 281-1 functions as a master controllerin the information processing apparatus 281-1, and the other informationprocessing controllers 111 function as slave controllers. Each of thefirst through third patterns of the second embodiment is equallyapplied. A temperature anomaly is detected in any of the informationprocessing controllers 111-1 through 111-p. In this way, whether tosuspend the process, whether to transfer part of the distributedprocessing, or whether to interchange part of the distributed processingis determined depending on the operation of the information processingcontrollers 111 connected to the bus 14 and the temperature measurementresults of the processors. One of the transfer target and theinterchange target is thus determined.

Information processing apparatuses 281-1 and 281-2, each having the samestructure as the information processing apparatus 281 can be connectedto the network 2. The plurality of information processing apparatuses101 (such as the information processing apparatuses 101-1 and 101-2 asshown in FIG. 34) can also be connected to the network 2. A temperatureanomaly may be detected in any of the information processing controllers111-1 through 111-p in the information processing apparatus 281-1, butneither transfer target nor interchange target may be found in each ofthe information processing controllers 111 connected to the bus 14. Insuch a case, one of the first through third patterns of the secondembodiment is used. One of a transfer target and an interchange targetmay be selected from the sub-processors 43 contained in each of theinformation processing apparatus 281-2 and the plurality of informationprocessing apparatuses 101.

The information processing controller of embodiments of the presentinvention may include a temperature detector to control the apparatus tofunction within a normal operating temperature range. Furthermore, theinformation processing apparatus may monitor power input to theinformation processing controller and prevent excessive power from beingconsumed by any single information processing controller to precludedevice degradation. In response to an increase in power consumption, theinformation processing controller of embodiments of the presentinvention permits the process to be transferred to or interchangedbetween sub-processors in at least one information processing apparatus.Device failure and lowered processing speed are thus avoided.

An information processing controller of an information processingapparatus of a third embodiment of the present invention is describedbelow with reference to FIGS. 35 through 52. The information processingcontroller of the third embodiment performs distributed processing inresponse to an increase in power consumption of processors.

FIG. 35 is a block diagram of an information processing apparatus 301-1.The information processing apparatus 301-1 includes a power measurementunit 321 measuring power consumed by an information processingcontroller 311, and, in an information processing controller 311, apower management processor 331 monitoring the state of a power supply 19and acquiring the measurement results of the power measurement unit 321.

As shown in FIG. 35, elements identical to those described withreference to FIG. 1 are designated with the same reference numerals, andthe discussion thereof is omitted herein as appropriate. The informationprocessing apparatus 301-1 of FIG. 35 includes, in place of theinformation processing controller 11, the information processingcontroller 311 including the power management processor 331 thatmonitors the state of the power supply 19 and acquires the measurementresults of the power measurement unit 321. The power measurement unit321 is newly arranged to measure power consumed by the one-chipinformation processing controller 311. The rest of the informationprocessing apparatus 301-1 is substantially identical to the informationprocessing apparatus 1 of FIG. 1.

The information processing apparatuses 301-2 through 301-n connected tothe network 2 are similar to the information processing apparatus 301-1in structure, and the discussion of the structure thereof is thusomitted herein. If it is not necessary to discriminate one from anotheramong the information processing apparatuses 301-1 through 301-n, eachinformation processing apparatus is simply referred to as an informationprocessing apparatus 301.

As shown in FIG. 36, the synchronous-rectifier type power measurementunit 321 is discussed. A direct-current resistance Rdc of an outputinductor is a finite value determined at design stage. A voltagemeasurement circuit 341 measures a voltage difference Vdrop across theoutput inductor, and a current value Iout supplied to the informationprocessing controller 311 is calculated from the measured voltagedifference Vdrop. The current value Iout is a current consumed by theinformation processing controller 311 as a load to the power supply 19.The direct-current resistance Rdc is sufficiently small with referenceto a load impedance viewed from the output terminal of the power supplycircuit. The consumed power is calculated by multiplying load impedanceby squared current consumption. With the voltage measurement circuit 341monitoring the voltage difference Vdrop across the output inductor, thepower consumption of the information processing controller 311 isindirectly monitored.

FIG. 37 illustrates the structure of a software program executed by theinformation processing controller 311 in accordance with the thirdembodiment of the present invention. The information processingcontroller 311 controls distributed processing assignment in response topower consumption. The software program is pre-recorded on the recorder13 connected to the information processing controller 311 prior to thepower on of the information processing apparatus 301-1.

As shown in FIG. 37, elements identical to those described withreference to FIG. 8 are designated with the same reference numerals, andthe discussion thereof is omitted herein. The structure of the softwareprogram stored in the main memory 12 of the information processingcontroller 311 in accordance with the third embodiment of the presentinvention is substantially identical to the software structure discussedwith reference to FIG. 8 except that a power management program iscontained as a control program. The power management program ispreferably a resident program that is continuously operative while themain power of the information processing apparatus 301 remains turnedon.

Under the control of the power management program, the power managementprocessor 331 gathers information about power consumption measured bythe power measurement unit 321 in the information processing apparatus301. Based on the power information, the information processingcontroller 311 controls the process executed by the main processor 42,and as necessary, the transfer or interchange of the process executed bythe sub-processors 43-1 through 43-8. The information processingcontroller 311 exchanges power information with other informationprocessing apparatuses 301 via the network 2, and then controls theprocess executed by the main processor 42, and as necessary, thetransfer or interchange of the process being executed by thesub-processors 43-1 through 43-8.

The control of the power information of the information processingapparatuses 301 connected to the network 2 and the transfer orinterchange of the process is performed in the following three patterns.

In a first pattern, the information processing apparatus 301-1, ifidentified as a master apparatus, manages own power management table butalso power management tables of the information processing apparatus301-2 through the information processing apparatus 301-n. Morespecifically, each of the information processing apparatus 301-2 throughthe information processing apparatus 301-n, as slave apparatuses,regularly transmits an updated power management table thereof to theinformation processing apparatus 301-1. The information processingapparatus 301-1 as the master apparatus monitors the power informationof all information processing apparatuses 301-1 through 301-n, and if anabnormal power consumption is detected in any of the informationprocessing apparatuses 301-1 through 301-n, the information processingapparatus 301-1 selects an appropriate information processing controller311 as a transfer target or an interchange target of the process fromall information processing controllers 311 of the information processingapparatuses 101 connected to the network 2. The information processingapparatus 301-1 transfers the process of the sub-processor 43 detectedto be power anomaly to the sub-processor 43 in the selected informationprocessing controller 311 or interchanges the processes between the twosub-processors 43.

In a second pattern, the information processing apparatus 301 monitorsown temperature management table, and if an abnormal power consumptionis detected in the power management table, the information processingapparatus 301 transmits, to all other information processing apparatuses301, a command requesting all other information processing apparatuses301 to transmit the power information. More specifically, upon receivinga command requesting the transmission of the power information, aninformation processing apparatus 301 not detecting any abnormal powerconsumption generates a power information reply command of FIG. 39, andtransmits the command to reply the generated power information to theinformation processing apparatus 301 as a source of the powerinformation request command.

The power information reply command contains information relating to apower consumption upper limit of AC power, a power consumption upperlimit of rechargeable battery power, and a power consumption upper limitof dry battery power, power connection information representing which ofAC power, rechargeable battery power, and dry battery power isconnected, and power consumption in a current process. The powerconsumption upper limit is determined at design stage of the informationprocessing apparatus and is an upper limit below which the informationprocessing apparatus 301 normally operates from the AC power. The powerconsumption upper limit may be a preferable power consumption upperlimit below which the information processing apparatus 301 operatesnormally and efficiently. The same is true of the power consumptionupper limits of the rechargeable battery power and the dry batterypower. The power connection information may be set at the design stageof the information processing apparatus 301. If the informationprocessing apparatus 301 works with a plurality of power sources, thepower connection information may be modified. The current powerconsumption is the one measured by the power measurement unit 321, andvaries depending on the operation state of the information processingapparatus 301.

Upon receiving the temperature information rely command, the informationprocessing apparatus 301 selects an appropriate information processingcontroller 311 as a transfer target or an interchange target of theprocess from all information processing controllers 311 of theinformation processing apparatuses 301 connected to the network 2. Theinformation processing apparatus 301 performs control process totransfer the process of the sub-processor 43 detected to be in anomalyto the sub-processor 43 in the selected information processingcontroller 311 or to interchange the processes between the twosub-processors 43.

In a third pattern, each information processing apparatus 301 monitorsown power management table, and if an abnormal power consumption isdetected in the power management table, the information processingapparatus 301 transmits, to all other information processing apparatuses301, a command requesting all other information processing apparatuses301 to transfer sub-processor programs. More specifically, uponreceiving a command requesting the transfer of the sub-processor programfrom the other information processing apparatus 301, an informationprocessing apparatus 301 not detecting any abnormal power consumptiongenerates, based on own power management table, a reply commandindicating whether own apparatus can be a transfer target of thesub-processor program. The information processing apparatus 301 thentransmits the reply command to the information processing apparatus 301as the source of the command requesting the transfer of thesub-processor program. Upon receiving the power information relycommand, the information processing apparatus 301 selects an informationprocessing controller 311 as a transfer target or an interchange targetof the process from all information processing controllers 311 of theinformation processing apparatuses 301 connected to the network 2. Theinformation processing apparatus 301 performs control process totransfer the process of the sub-processor 43 detected to be in anomalyto the sub-processor 43 in the selected information processingcontroller 311 or to interchange the processes between the twosub-processors 43.

FIG. 38 is a functional block diagram of the information processingcontroller 311 that performs the control process in the first pattern inaccordance with the third embodiment of the present invention. Elementsidentical to those described with reference to FIG. 21 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the first pattern of the information processingcontroller 311 of the third embodiment as shown in FIG. 38, the mainprocessor 42 includes a power anomaly correction controller 356, alogical thread management processor 357, and a power managementinformation transmission and reception controller 358 in place of thetemperature anomaly correction controller 216, the logical threadmanagement processor 217, and the temperature management informationtransmission and reception controller 214. The rest of the mainprocessor 42 is identical to the main processor 42 of FIG. 21. The thirdembodiment of the present invention employs a power management processor331 in place of the temperature monitoring processor 122 of FIG. 21. Thepower management processor 331 includes a power information acquisitionunit 351, an interrupt controller 352, a timer 353, a power managementtable 354, and a power rise detector 355.

The power information acquisition unit 351 acquires power informationfrom a power measurement unit 321 at timing controlled by the interruptcontroller 352, thereby updating the power management table 354. Theinterrupt controller 352 references the timer 353 and timer-interruptsthe power information acquisition unit 351. In response to informationsupplied from the power rise detector 355, the interrupt controller 352interrupts the arithmetic processor 161 and the power anomaly correctioncontroller 356.

Under the control of the power anomaly correction controller 356, thepower management information transmission and reception controller 358controls transmitting, via the communication unit 16, the powermanagement table or a variety of commands (software cell) generated forpower management to the other information processing apparatuses 301connected to the network 2. The power management informationtransmission and reception controller 358 controls receiving, via thecommunication unit 16, the temperature management table of the otherinformation processing apparatuses 101 or a variety of commands(software cell) generated for temperature management from the otherinformation processing apparatuses 301 connected to the network 2. Thetemperature management table or the variety of commands (software cell)generated for power management are collectively referred to as powermanagement information if there is no need for discriminatinginformation relating to temperature management of a plurality ofinformation processing apparatuses 301 connected to the network 2 andinformation relating to the control of distributed processing executedbased on the temperature management.

The power management table 354 holds information for managing powerconsumption of the information processing controller 311. If ownapparatus is a slave apparatus, the power management table 354 holds ownpower information, and if own apparatus is a mater apparatus, the powermanagement table 354 holds power information of all informationprocessing apparatuses 301 connected to the network 2. As shown in FIG.40, the power information contains a controller ID identifying eachinformation processing controller 311, the power consumption upper limitof the AC power, the power consumption upper limit of the rechargeablebattery 73, the power consumption upper limit of the dry battery, thepower connection information indicating which of the AC power, therechargeable battery power, and the dry battery power is connected, andthe power consumed in the current process. The power consumption upperlimit is determined at design stage of the information processingapparatus and is an upper limit below which the information processingapparatus 301 normally operates from the AC power. The power consumptionupper limit may be a preferable power consumption upper limit belowwhich the information processing apparatus 301 operates normally andefficiently. The same is true of the power consumption upper limits ofthe rechargeable battery power 73 and the dry battery power. The powerconnection information may be set at the design stage of the informationprocessing apparatus 301. If the information processing apparatus 301works with a plurality of power sources, the power connectioninformation may be modified. The current power consumption is the onemeasured by the power measurement unit 321, and varies depending on theoperation state of the information processing apparatus 301.

If own apparatus is a master apparatus, the power rise detector 355references the power management table 354. If a power consumption valueabove the predetermined upper limit is found in power detection resultsof all information processing apparatuses 301 connected to the network2, the power rise detector 355 notifies the interrupt controller 352 ofthe detection of the power consumption anomaly, thereby causing theinterrupt controller 352 to interrupt the arithmetic processor 161 andthe power anomaly correction controller 356.

If own apparatus is a master apparatus, the power anomaly correctioncontroller 356 references the power management table 354 in response toan interrupt from the interrupt controller 352. The power anomalycorrection controller 356 thus detects which of the informationprocessing apparatuses 301 connected to the network 2 is in powerconsumption anomaly. Based on the detection results, the power anomalycorrection controller 356 controls the logical thread managementprocessor 357, thereby stopping the process or transferring the processof the sub-processor 43 in the information processing apparatus 301detected in power anomaly to another sub-processor 43 or interchangingthe processes between the two sub-processor 43.

The logical thread management processor 357 generates or deletes alogical thread of an application program performed by the arithmeticprocessor 161. If own apparatus is a master apparatus, the logicalthread management processor 357 monitors the state of the logical threadin distributed processing performed by one of the information processingapparatuses 301 connected to the network 2 and controls the distributedprocessing. If own apparatus is the master apparatus, the logical threadmanagement processor 357 generates a table listing managementinformation of all information processing apparatuses 301 connected tothe network 2 and a table listing information required to execute thelogical thread on a per executed logical thread basis. The logicalthread management processor 357 thus controls the execution of thelogical thread by referencing and updating the information of thetables.

If own apparatus is a master apparatus, the logical thread managementprocessor 357 generates a software cell controlling the process of thethread to be executed by another information processing apparatus 301 asnecessary, and transmits the generated software cell via thecommunication unit 16. If own apparatus is a slave apparatus, thelogical thread management processor 357 receives, via the communicationunit 16, a software cell transmitted from a master informationprocessing apparatus 301. The logical thread management processor 357causes the sub-processor 43 to perform the distributed processingresponsive to the software cell, generates a software cell correspondingto a reply or a response, and transmits the generated software cell viathe communication unit 16. Regardless whether own apparatus 301 is amaster apparatus or a slave apparatus, the logical thread managementprocessor 357 acquires, via the communication unit 16, informationrelating to a thread already executed by the other informationprocessing apparatus 301.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 38. For example, part of the functionof the main processor 42 may be carried out by the power managementprocessor 331, part of the function of the power management processor331 may be performed by the main processor 42, or these functions may beperformed by different hardware. Even in such a case, the presentinvention is perfectly applicable.

The first pattern operation of the third embodiment of the presentinvention is described below with reference to flowcharts of FIGS. 41through 44.

An application program execution process 2 to be executed by theinformation processing apparatus 301 of the third embodiment of FIG. 38is described below with reference to a flowchart of FIG. 41. The powermanagement program is a resident program that is continuously operativewhile the main power of the information processing apparatus 301 remainsturned on.

In step S301, the arithmetic processor 161 determines whether a user hasinput a command to execute an application program. More specifically, instep S301, the main processor 42 determines, in response to a signalsupplied from the operation input unit 15 via the bus 14 and the bus 41,whether the command to execute the application program has been issued.If it is determined in step S301 that the command to execute theapplication program has not been issued, the process of S301 is repeateduntil it is determined that the command to execute the applicationprogram has been issued.

If it is determined in step S301 that the command to execute theapplication program has been issued, the arithmetic processor 161 setsthe assignment of the logical thread to the sub-processors and suppliesthe setting information of the logical thread to the logical threadmanagement processor 357 in step S302.

In step S303, the logical thread management processor 357 loads aprogram and data for executing the assigned process to the code area 187and the data area 188 of the local storage 51 in the sub-processor 43 towhich the logical thread is assigned.

In step S304, the arithmetic processor 161 and the logical threadmanagement processor 357 control the execution of the applicationprogram including the process of the sub-processor 43. The arithmeticprocessor 181 in the sub-processor 43 performs the assigned process.

The power management program is a resident program that is continuouslyoperative while the main power of the information processing apparatus301 remains turned on, and the process is performed throughout a periodwhile steps S301 through S304 are executed. The power informationmanagement process of the master apparatus will be described later withreference to a flowchart of FIG. 42, and the power informationmanagement process of the slave apparatus will be described later withreference to a flowchart of FIG. 44.

In step S305, the arithmetic processor 161 determines whether aninterrupt responsive to the occurrence of a power anomaly is issued fromthe interrupt controller 352. If it is determined in step S305 that aninterrupt responsive to the occurrence of a power anomaly is not issued,processing proceeds to step S308.

If it is determined in step S305 that an interrupt responsive to theoccurrence of a power anomaly is issued, the current process issuspended. In step S306, the arithmetic processor 161 determines whetherthe interrupt is released. If it is determined in step S306 that theinterrupt is not yet released, the process at step S306 is repeateduntil it is determined that the interrupt has been released.

If it is determined in step S306 that the interrupt has been released,the arithmetic processor 161 supplies the logical thread managementprocessor 357 with the setting information of the logical thread asnecessary. The logical thread management processor 357 thus updates thetable relating to the logical thread management.

If it is determined in step S305 that the interrupt responsive to theoccurrence of a power consumption anomaly has not been issued, thearithmetic processor 161 determines in step S308 subsequent to the endof step S307 whether the process of the application program has beencompleted. If it is determined in step S308 that the process of theapplication program has not been completed, processing returns to stepS304 to repeat step S304 and subsequent steps. If it is determined instep S308 that the process of the application program has beencompleted, processing ends.

The selected sub-processor 43 performs the distributed processingcorresponding to the application program performed by the main processor42.

A power information management process of the master apparatus isdescribed below with reference to the flowchart of FIG. 42.

In step S321, the power information acquisition unit 351 determineswhether a timer interrupt has been issued from the interrupt controller352.

If it is determined in step S321 that no timer interrupt has beenissued, the power management information transmission and receptioncontroller 358 determines in step S322 whether a power management tablehas been received from any of the information processing apparatuses 301connected to the network 2. If it is determined in step S322 that nopower management table has been received, processing returns to stepS321 to repeat step S321 and subsequent steps. If it is determined instep S322 that a power management table has been received, processingproceeds to step S324.

If it is determined in step S321 that a timer interrupt has beenreceived, the power information acquisition unit 351 acquires powermeasurement results from each power measurement unit 321 in step S323.

If it is determined in step S322 that a power management table has beenreceived, or subsequent to step S323, the power information acquisitionunit 351 updates, in step S324, the power management table 354 based onthe power management table of the other information processing apparatus301 received in step S322, or own power information acquired in stepS323.

In step S325, the power rise detector 355 references the powermanagement table 354 to determine whether a power anomaly is containedin the power information, in other words, whether any of the powerdetection results of all power measurement units 321 arranged in theinformation processing apparatuses 101 connected to the network 2 isabove the predetermined power consumption upper limit. If it isdetermined in step S325 that no abnormal power value is contained in thepower information, processing returns to step S321 to repeat step S321and subsequent steps.

If it is determined in step S325 that an abnormal power value iscontained in the power information, the power rise detector 355 notifiesthe interrupt controller 352 of the detection of an abnormal powerconsumption, thereby causing the interrupt controller 352 to interruptthe arithmetic processor 161 and the power anomaly correction controller356 in step S326. The interrupt controller 352 interrupts thetemperature anomaly correction controller 216 and the arithmeticprocessor 161, thereby causing the arithmetic processor 161 to stop theprocess of the application program and the power anomaly correctioncontroller 356 to start an anomaly-time process 5.

The anomaly-time process 5 to be discussed later with reference to FIG.43 is performed in step S327.

In step S328, the power anomaly correction controller 356 controls thelogical thread management processor 357 in accordance with theanomaly-time process 5 executed in step S327, thereby causing thelogical thread management processor 357 to update a table for threadmanagement as necessary.

In step S329, the interrupt controller 352 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S321 to repeat step S321and subsequent steps.

The master information processing apparatus 301 acquires the powermanagement table updated based on the power information obtained by eachpower measurement unit 321 arranged in each of all informationprocessing apparatuses 301 connected to the network 2, and manages thetable as the power management table 354. Whether to perform ananomaly-time interrupt process is thus determined based on the powermanagement table 354 stored in the master information processingapparatus 301.

The anomaly-time process 5 executed in step S327 of FIG. 42 is describedbelow with reference to a flowchart of FIG. 43.

In step S341, the logical thread management processor 357 references thepower management table 354 to determine whether the process of allsub-processors 43 contained in the information processing controller 311detected to be power anomaly is transferable. If it is determined instep S341 that the process of all sub-processors 43 contained in theinformation processing controller 311 detected to be power anomaly isnot transferable, processing proceeds to step S346.

If it is determined in step S341 that the process of all sub-processors43 contained in the information processing controller 311 detected to bepower anomaly is transferable, the power anomaly correction controller356 references the power management table 354 in step S342. In stepS342, the power anomaly correction controller 356 selects an informationprocessing controller 311 as a transfer target from among theinformation processing controllers 311 of the information processingapparatuses 301 connected to the network 2, and notifies the logicalthread management processor 357 of the selection results. Morespecifically, by referencing the power management table 354, the poweranomaly correction controller 356 selects, an information processingcontroller 311 able to execute the process of the sub-processor 43 inoperation and consuming the lowest power from among the informationprocessing controllers 311 in the information processing apparatuses 301connected to the network 2. If a plurality of information processingcontrollers 311 satisfying the criteria are available, the power anomalycorrection controller 356 may select one having the lowest processor IDnumber. Alternatively, in the selection, the power anomaly correctioncontroller 356 may place a higher priority on an information processingcontroller 311 in the other information processing apparatus 301operating from the AC power than on an information processing controller311 in the other information processing apparatus 301 operating from therechargeable battery or the dry battery.

The logical thread management processor 357 in the main processor 42 inthe information processing controller 311 selected as a transfer targetdetermines which sub-processors 43 to assign the distributed processingto.

In step S343, the logical thread management processor 357 evacuates thecontext of the process of the information processing controller 311consuming power above the power consumption upper limit.

If the information processing controller 311 operating at power abovethe power consumption upper limit is in a master apparatus, theinterrupt controller 185 receives an interrupt command instructing theevacuation of the context of the current process, and stops the processof the arithmetic processor 181. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43as the transfer target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 357 (aportion of the storage area of the local storage 51 of the mainprocessor 42). If the sub-processor 43 does not pre-store commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the data of the code area 187 through the stack area 190to the information storage area managed by the logical thread managementprocessor 357 (the portion of the storage area of the local storage 51of the main processor 42).

If the information processing controller 311 detected to be operating atpower above the power consumption upper limit is in a slave apparatus,the interrupt controller 185 stops the process of the arithmeticprocessor 181 in response to an interrupt command instructing theevacuation of the context of the current process. The thread transferand interchange processor 186 evacuates the context of the currentlyrunning program (the values of the register 182, the floating-pointregister 183, and the program counter 184) to the stack area 190. If thesub-processor 43 as the transfer target pre-stores the commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the content of the stack area 190 and the data area 189 toan information storage area managed by the logical thread managementprocessor 357 (a portion of the storage area of the local storage 51 ofthe main processor 42) in the information processing apparatus 101functioning as a master apparatus via the bus 41, the bus 14, thecommunication unit 16 and the network 2. If the sub-processor 43 doesnot pre-store commonly used program and model data, the thread transferand interchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 357 (the portion of the storagearea of the local storage 51 of the main processor 42) in theinformation processing apparatus 101 functioning as the master apparatusvia the bus 41, the bus 14, the communication unit 16 and the network 2.

In step S344, the logical thread management processor 357 stops theoperation of the sub-processor 43 of the information processingcontroller 311 detected to be operating at power above the powerconsumption upper limit.

In step S345, the logical thread management processor 357 restores thecontext, evacuated in step S343, to the sub-processor 43 selected as atransfer target sub-processor. More specifically, if the transfer targetsub-processor 43 is the one in the master apparatus, the logical threadmanagement processor 357 supplies the context stored in an informationstorage area managed by itself to the transfer target sub-processor 43via the bus 41. If the transfer target sub-processor 43 is the one inthe slave apparatus, the logical thread management processor 357supplies the context stored in the information storage area manageditself to the transfer target sub-processor 43 contained in theinformation processing apparatus 301 functioning as the slave apparatus,via the bus 41, the bus 14, the communication unit 16 and the network 2.The sub-processor 43 selected as the transfer target sub-processorstores the supplied context in areas corresponding to the code area 187through the stack area 19 0. Processing returns to step S327 and thenproceeds to step S238 as shown in FIG. 42.

If it is determined in step S341 that the process of all sub-processors43 contained in the information processing controller 311 detected to bein power consumption anomaly is not transferable, the power anomalycorrection controller 356 references the power management table 354 instep S346. In step S346, the power anomaly correction controller 356selects a sub-processor 43 in the information processing controller 311as an interchange target from among the sub-processors 43 of theinformation processing controllers 311 of the information processingapparatuses 301 connected to the network 2, and notifies the logicalthread management processor 357 of the selection results. Morespecifically, the power anomaly correction controller 356 selects, as aninterchange target information processing controller 311 with priority,one operating at the lowest power consumption from among the informationprocessing controllers 311 of the information processing apparatuses 301connected to the network 2. Alternatively, in the selection, the poweranomaly correction controller 356 may place a higher priority on aninformation processing controller 311 in the other informationprocessing apparatus 301 operating from the AC power than an informationprocessing controller 311 in the other information processing apparatus301 operating from the rechargeable battery or the dry battery. If aplurality of information processing controller 311 satisfy the criteria,the power anomaly correction controller 356 selects an informationprocessing controller 311 having the smallest processor ID number as aninterchange target.

If any of the local storages 51 of the sub-processor 43 having nodistributed processing assignment is supplied beforehand with thecommonly used programs and model data required for the process, theinformation processing controller 311 with the local storage 51 of thesub-processor 43 having with the commonly used program and model datastored therewithin may be selected with priority.

The logical thread management processor 357 in the main processor 42 inthe information processing controller 311 selected as the interchangetarget determines which sub-processors 43 to assign the distributedprocessing to.

In step S347, the logical thread management processor 357 evacuates thecontext of the process being executed by the sub-processor 43 in theinformation processing apparatus 301 detected to be operating at powerabove the power consumption upper limit.

If the information processing controller 311 detected to consume powerabove the power consumption upper limit is in a master apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 357 (aportion of the storage area of the local storage 51 of the mainprocessor 42). If the sub-processor 43 does not pre-store commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the data of the code area 187 through the stack area 190to the information storage area managed by the logical thread managementprocessor 357 (the portion of the storage area of the local storage 51of the main processor 42).

If the information processing controller 311 detected to consume powerabove the power consumption upper limit is in a slave apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 357 (aportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 101 functioning asa master apparatus via the bus 41, the bus 14, the communication unit 16and the network 2. If the sub-processor 43 does not pre-store commonlyused program and model data, the thread transfer and interchangeprocessor 186 transfers the data of the code area 187 through the stackarea 190 to the information storage area managed by the logical threadmanagement processor 357 (the portion of the storage area of the localstorage 51 of the main processor 42) in the information processingapparatus 301 functioning as the master apparatus via the bus 41, thebus 14, the communication unit 16 and the network 2.

In step S348, the logical thread management processor 357 stops theoperation of the sub-processor 43 of the information processingcontroller 311 detected to be in power consumption anomaly.

In step S349, the logical thread management processor 357 evacuates thecontext of the process being executed by the sub-processor 43 in theinformation processing controller 311 selected as the interchangetarget.

If the information processing controller 311 selected as the interchangetarget is in a master apparatus, the interrupt controller 185 suspendsthe process of the arithmetic processor 181 in response to an interruptcommand to evacuate the currently processed context. The thread transferand interchange processor 186 evacuates the context of the currentlyexecuted program (the values of the register 182, the floating-pointregister 183, and the program counter 184) to the stack area 190. If thesub-processor 43 in an interchange source pre-stores the commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the content of the stack area 190 and the data area 189 toan information storage area managed by the logical thread managementprocessor 357 (a portion of the storage area of the local storage 51 ofthe main processor 42). If the sub-processor 43 does not pre-storecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 357 (the portion of the storagearea of the local storage 51 of the main processor 42).

If the information processing controller 311 detected to be above thetemperature upper limit is in a slave apparatus, the interruptcontroller 185 stops the process of the arithmetic processor 181 inresponse to an interrupt command instructing the evacuation of thecontext of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange source pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 357 (aportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 301 operating as amaster apparatus via the bus 41, the bus 14, the communication unit 16and the network 2. If the sub-processor 43 does not pre-store commonlyused program and model data, the thread transfer and interchangeprocessor 186 transfers the data of the code area 187 through the stackarea 190 to the information storage area managed by the logical threadmanagement processor 357 (the portion of the storage area of the localstorage 51 of the main processor 42) in the information processingapparatus 301 operating as the master apparatus via the bus 41, the bus14, the communication unit 16 and the network 2.

In step S350, the logical thread management processor 357 stops theoperation of the sub-processor 43 in the information processingcontroller 311 selected as an interchange target.

In step S351, the logical thread management processor 357 interchangescontexts between the context-evacuated sub-processors 43 of theinformation processing controllers 311 to restore the contexts there.More specifically, the logical thread management processor 357 restoresthe context, evacuated in step S347, to the sub-processor 43 of theinformation processing controller 311 selected as the interchange targetof the process while restoring the context, evacuated in step S349, tothe sub-processor 43 of the information processing controller 311detected to consume power above the power consumption upper limit. Ifthe information processing controller 311 detected to consume powerabove the power consumption upper limit or the interchange targetinformation processing controller 311 is the one in the masterapparatus, the logical thread management processor 357 supplies thecorresponding context stored in the information storage area managed byitself to the interchange target sub-processor 43 in the interchangetarget via the bus 41. If the information processing controller 311detected to consume power above the power consumption upper limit or theinterchange target information processing controller 311 is the one inthe slave apparatus, the logical thread management processor 357supplies the corresponding context stored in the information storagearea managed by itself to the sub-processor 43 in the informationprocessing controller 311 as the interchange target contained in theinformation processing apparatus 301 operating as the slave apparatusvia the bus 41, the bus 14, the communication unit 16 and the network 2.Each sub-processor 43 in the two information processing controllers 311stores the supplied context in corresponding areas of the code area 187through the stack area 190. Processing returns to step S327 and thenproceeds to step S328 of FIG. 42.

In this way, whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined depending on the location of thepower consumption anomaly, the operation of the information processingcontroller 311 in the information processing apparatus 301 connected tothe network 2, and the power measurement values of the processors. Oneof the transfer target and the interchange target is also determined.

A power information management process of the slave apparatus executedin parallel with the power information management process of the masterapparatus discussed with reference to FIG. 42 is described below withreference to a flowchart of FIG. 44.

In step S381, the power information acquisition unit 351 in theinformation processing apparatus 301 functioning as a slave apparatusdetermines whether a timer interrupt has been input from the interruptcontroller 352. If it is determined in step S381 that no timer interrupthas been input, the process in step S381 is repeated until it isdetermined that a timer interrupt has been input.

If it is determined in step S381 that a timer interrupt has been input,the power information acquisition unit 351 acquires the powerinformation from each of the power measurement units 321 in step S382.

In step S383, the power information acquisition unit 351 updates thepower management table 354 based on the power information acquired instep S382.

In step S384, the power management information transmission andreception controller 358 transmits the power management table 354,updated in step S383, to the information processing apparatus 301functioning as the master apparatus via the communication unit 16 andthe network 2. Processing returns to step S381 to repeat step S381 andsubsequent steps.

The power management table of the slave apparatus is transmitted to themaster apparatus. The transmitted power management table of the slaveapparatus is managed by the master apparatus.

In accordance with the third embodiment of the present invention, theplurality of information processing apparatuses 301 connected to thenetwork 2, each having the power measurement unit 321 arranged tomeasure power consumption of the information processing controller 311,perform the process as discussed with reference to FIGS. 41-44. With thefirst pattern control of the temperature information and the transfer orinterchange of the process, device failure or lowered processing speeddue to heat is prevented while the suspension of the process in themiddle thereof is minimized.

FIG. 45 is a functional block diagram illustrating the informationprocessing controller 311 that performs control in the second pattern inaccordance with the third embodiment of the present invention. Elementsidentical to those discussed with reference to FIG. 38 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the information processing controller 311 of FIG. 45performing the second pattern control in accordance with the thirdembodiment of the present invention, a memory 371, a power managementinformation transmission and reception controller 372, and a poweranomaly correction controller 374 are used in place of the memory 213,the power management information transmission and reception controller358, and the power anomaly correction controller 356, respectively. Therest of the main processor 42 is identical to the main processor 42 ofFIG. 38. The power management processor 331 uses a power managementtable 373 in place of the power management table 354. The rest of thepower management processor 331 is identical to the power managementprocessor 331 of FIG. 38.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 41. For example, part of the functionof the main processor 42 may be carried out by the power managementprocessor 331, part of the function of the power management processor331 may be performed by the main processor 42, or these functions may beperformed by different hardware. Even in such a case, the presentinvention is perfectly applicable.

The memory 371 corresponds to at least part of the storage area of themain memory 12, stores at least part of the device information of theinformation processing apparatus 301 connected to the network 2 whilestoring temporarily the power management table of another informationprocessing apparatus 301 received by the power management informationtransmission and reception controller 372. Under the control of thepower anomaly correction controller 374, the power managementinformation transmission and reception controller 372 controlstransmitting, via the 16, the power management information or a varietyof commands (software cell) generated for power management to the otherinformation processing apparatus 301 connected to the network 2. Thepower management information transmission and reception controller 372also controls receiving, via the communication unit 16, the powermanagement information or a variety of commands (software cell) forpower management from the other information processing apparatus 301connected to the network 2.

If the power rise detector 355 detects the occurrence of a power anomalyin the information acquired by own power information acquisition unit351, followed by an interrupt process of the interrupt controller 352,the power anomaly correction controller 374 generates a commandrequesting all other information processing apparatuses 301 connected tothe network 2 to transmit the power management information. The poweranomaly correction controller 374 controls the power managementinformation transmission and reception controller 372 to transmit thegenerated command. If the power management information transmission andreception controller 372 receives, from another information processingapparatus 301 connected to the network 2, a command requesting thetransmission of the power management information, the power anomalycorrection controller 374 generates a power information reply command ofFIG. 39 based on the information held in the power management table 373,and controls the power management information transmission and receptioncontroller 372 to transmit the generated power information replycommand.

Regardless of whether own apparatus is a master apparatus or a slaveapparatus, the power management table 373 stores own temperaturemanagement table information updated based on the information acquiredfrom own power information acquisition unit 351.

The second pattern operation of the third embodiment is described belowwith reference to flowcharts of FIGS. 46 and 47. In accordance with thethird embodiment, the application program execution process in thesecond pattern is basically identical to the application programexecution process in the first pattern discussed with reference to FIG.41, and the discussion thereof is omitted herein.

A power information management process 2 is described below withreference to a flowchart of FIG. 46.

In step S401, the interrupt controller 352 determines whether a timerinterrupt has been input from the interrupt controller 352. If it isdetermined in step S401 that a timer interrupt has not been received,the step in step S401 is repeated until it is determined that a timerinterrupt has been input.

If it is determined in step S401 that a timer interrupt has been input,a process substantially identical to that performed in steps S323through S325 of FIG. 42 is performed in steps S402 through S404. Morespecifically, if it is determined that a timer interrupt has been input,the power information acquisition unit 351 acquires power informationfrom each of the power measurement unit 321, and updates the powermanagement table 373. The power rise detector 355 references the powermanagement table 373 to determine whether an abnormal value is containedin the power information.

If it is determined in step S404 that no abnormal value is contained inthe power information, the power anomaly correction controller 374determines in step S405 whether the power management informationtransmission and reception controller 372 has received, from anotherinformation processing apparatus 301 connected to the network 2, acommand requesting the transmission of the power management information.If it is determined in step S405 that the power management informationtransmission and reception controller 372 has not received, from theother information processing apparatus 301 connected to the network 2, acommand requesting the transmission of the power management information,processing returns to step S401 to repeat step S401 and subsequentsteps.

If it is determined in step S405 that a command requesting thetransmission of the power management information has been received fromthe other information processing apparatus 301, the power anomalycorrection controller 374 generates the power information reply commandof FIG. 39 based on the power management table information stored in thepower management table 373 in step S406. The power anomaly correctioncontroller 374 controls the power management information transmissionand reception controller 372 to transmit the generated power informationreply command. Processing returns to step S401 to repeat step S401 andsubsequent steps.

If it is determined in step S404 that an abnormal value is contained inthe power information, the power rise detector 355 notifies theinterrupt controller 352 of the detection of the abnormal powerconsumption rise, thereby causing the interrupt controller 352 tointerrupt the arithmetic processor 161 and the power anomaly correctioncontroller 374 in step S407. The interrupt controller 352 interrupts thearithmetic processor 161 and the power anomaly correction controller374, thereby stopping the process of the application program controlledby the arithmetic processor 161 and causing the power anomaly correctioncontroller 374 to start an anomaly-time process 6.

The anomaly-time process 6 to be discussed later with reference to FIG.47 is executed in step S408.

In step S409, the power anomaly correction controller 374 controls thelogical thread management processor 357 based on the anomaly-timeprocess 6 executed in step S408, thereby updating the table of thelogical thread management as necessary.

In step S410, the interrupt controller 352 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S401 to repeat step S401and subsequent steps.

Regardless of whether each information processing apparatus 301connected to the network 2 is a master apparatus or a slave apparatus, apower consumption anomaly of own apparatus is detected based on thepower management table updated based on the power information detectedby own power measurement unit 321. In the event of the anomaly, theinterrupt process is performed and the anomaly-time process 6 to bediscussed later is performed. If the request to transmit the powerinformation is received from the other information processing apparatus301 connected to the network 2, the power information reply command ofFIG. 39 is generated, and then transmitted to the requesting informationprocessing apparatus 301.

The anomaly-time process 6 executed in step S408 of FIG. 46 is describedbelow with reference to a flowchart of FIG. 47.

In step S431, the power anomaly correction controller 374 generates acommand requesting all other information processing apparatuses 301connected to the network 2 to transmit the power management information,and controls the power management information transmission and receptioncontroller 372 to transmit the generated command. The power managementinformation transmission and reception controller 372 transmits thecommand requesting the transmission of the power management informationto all other information processing apparatuses 301 connected to thenetwork 2 via the communication unit 16 and the network 2.

In step S432, the power management information transmission andreception controller 372 receives the power information reply command ofFIG. 39 and supplies the power anomaly correction controller 374 withthe received command.

In step S433, the power anomaly correction controller 374 determines,based on the power information reply commands transmitted from all otherinformation processing apparatuses 301 connected to the network 2,whether the process of the information processing apparatus 301 detectedto be in power consumption anomaly is transferable.

If it is determined in step S433 that the process is transferable, aprocess basically identical to that performed in steps S342 through S345of FIG. 43 is performed in steps S434 through S437. More specifically,the power management table 373 is referenced, an information processingcontroller 311 is selected as a transfer target from among theinformation processing controllers 311 in the information processingapparatuses 301 connected to the network 2, the context of the processbeing executed by the sub-processor 43 of the information processingcontroller 311 detected to consume power above the power consumptionupper limit is evacuated, the operation of the sub-processor 43 of theinformation processing controller 311 detected to consume power abovethe power consumption upper limit is stopped, and the evacuated contextis restored back to the sub-processor 43 of the information processingcontroller 311 as the transfer target.

Subsequent to step S437, processing returns to step S408 and proceeds tostep S409 of FIG. 46.

If it is determined in step S433 that the process is not transferable, aprocess basically identical to that performed in steps S346 through S351of FIG. 43 is performed in steps S438 through S443. More specifically,the power management table 373 is referenced, an information processingcontroller 311 is selected as an interchange target from among theinformation processing controllers 311 in the information processingapparatuses 301 connected to the network 2, the context of the processbeing executed by the information processing controller 311 detected toconsume power above the power consumption upper limit is evacuated, andthe operation of the sub-processor 43 of the information processingcontroller 311 detected to consume power above the power consumptionupper limit is stopped.

The context of the process being executed by the sub-processor 43 of theinformation processing controller 311 selected as the interchange targetof the process is evacuated, the operation of the sub-processor 43 ofthe information processing controller 311 selected as the interchangetarget of the process is stopped, and the contexts of the sub-processors43 of the two information processing controllers 311 are interchangedfor restoration.

Subsequent to step S443, processing returns to step S408 and proceeds tostep S409 of FIG. 46.

If a power anomaly occurs in one information processing controller 311,information relating to the operation of the information processingcontrollers 311 connected to the network 2 and the power consumption ofthe processors in the information processing controllers 311 isacquired. Whether to suspend the process, whether to transfer part ofthe distributed processing, or whether to interchange part of thedistributed processing is determined based on the acquired information.One of the transfer target and the interchange target is alsodetermined.

In accordance with the third embodiment of the present invention, theplurality of information processing apparatuses 401 connected to thenetwork 2, each having the information processing controller 311 withthe power measurement unit 312, perform the process as discussed withreference to FIGS. 45-47. With the second pattern control of the powerinformation and the transfer or interchange of the process, devicefailure or lowered processing speed due to heat is prevented.

FIG. 48 is a functional block diagram illustrating the informationprocessing controller 311 that performs control in the third pattern inaccordance with the third embodiment of the present invention. Elementsidentical to those discussed with reference to FIG. 38 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the information processing controller 311 of FIG. 48performing the third pattern control in accordance with the thirdembodiment of the present invention, a power management informationtransmission and reception controller 391 and a power anomaly correctioncontroller 392 are used in place of the power management informationtransmission and reception controller 358 and the power anomalycorrection controller 356, respectively. The rest of the main processor42 is identical to the main processor 42 of FIG. 38. The powermanagement processor 331 uses the power management table 373, discussedwith reference to FIG. 45, in place of the power management table 354.The rest of the power management processor 331 is identical to the powermanagement processor 331 of FIG. 38.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 48. For example, part of the functionof the main processor 42 may be carried out by the power managementprocessor 331, part of the function of the power management processor331 may be performed by the main processor 42, or these functions may beperformed by different hardware. Even in such a case, the presentinvention is perfectly applicable.

Under the control of the power anomaly correction controller 392, thepower management information transmission and reception controller 391controls transmitting, via the 16, the power management information or avariety of commands (software cell) generated for power management tothe other information processing apparatus 301 connected to the network2. The power management information transmission and receptioncontroller 391 also controls receiving, via the communication unit 16,the power management information or a variety of commands (softwarecell) for power management from the other information processingapparatus 301 connected to the network 2.

If the power rise detector 355 detects the occurrence of a power anomalyin the information acquired by own power information acquisition unit351, the interrupt controller 352 performs an interrupt process. Thepower anomaly correction controller 392 generates a sub-processorprogram transfer command requesting all other information processingapparatuses 101 connected to the network 2 to transfer or interchangethe process of the current logical thread of own sub-processor 43. Thepower anomaly correction controller 392 also controls the powermanagement information transmission and reception controller 391 totransmit the generated command. When the power management informationtransmission and reception controller 391 receives, from the otherinformation processing apparatus 301 connected to the network 2, asub-processor program transfer request command, the power anomalycorrection controller 392 generates a sub-processor program transferreply command based on power management table information stored in thepower management table 373. The power anomaly correction controller 392controls the power management information transmission and receptioncontroller 391 to transmit the generated sub-processor program transferreply command.

The sub-processor program transfer request command contains informationof a sub-processor usage ratio of the process (thread) being executed bythe sub-processor 43 detected to be in power anomaly, and a localstorage capacity of the sub-processor 43.

The sub-processor program transfer reply command contains informationrelating to whether to accept the transfer request of the sub-processorprogram (transfer OK, interchange OK, or transfer/interchangeunpermissible), and a sub-processor ID if the correspondingsub-processor accepts the sub-processor program transfer request. Thepower anomaly correction controller 392 determines whether to accept thesub-processor program transfer request, whether to accept thesub-processor program interchange request, or whether to reject the tworequests, based on in the information contained in the sub-processortransfer request command, namely, the sub-processor usage ratio of thesub-processor, detected to be in power anomaly, performing the process(thread), and the local storage capacity of the sub-processor, and thepower management table stored in the power management table 373.

Regardless of whether own apparatus is a master apparatus or a slaveapparatus, the power management table 373 holds own power managementtable information updated based on the information acquired by own powerinformation acquisition unit 351.

The operation of the third pattern of the third embodiment is describedbelow with reference to flowcharts of FIGS. 49 and 50. In accordancewith the third embodiment of the present invention, the applicationprogram execution process of the third pattern is basically identical tothe application program execution process of the first pattern discussedwith reference to FIG. 41, and the discussion thereof is omitted herein.

A power information management process 3 is described below withreference to a flowchart of FIG. 49.

A process substantially identical to that performed in steps S401through S404 of FIG. 46 is performed in steps S461 through S464 of FIG.46. More specifically, if it is determined that a timer interrupt hasbeen received, the power information acquisition unit 351 acquires powerinformation from each of the power measurement unit 321, and updates thepower management table 373. The power rise detector 355 references thepower management table 373 to determine whether an abnormal value iscontained in the power information.

If it is determined in step S464 that no abnormal value is contained inthe power information, the power anomaly correction controller 392determines in step S465 whether the power management informationtransmission and reception controller 391 has received, from anotherinformation processing apparatus 301 connected to the network 2, asub-processor program transfer request command. If it is determined instep S465 that the power management information transmission andreception controller 391 has not received, from the other informationprocessing apparatus 301, the sub-processor program transfer requestcommand, processing returns to step S461 to repeat step S461 andsubsequent steps.

If it is determined in step S465 that the sub-processor program transferrequest has been received from the other information processingapparatus 301, the power anomaly correction controller 392 determineswhether to accept the sub-processor program transfer request. Thisdetermination is performed based on the sub-processor usage ratio of thesub-processor detected to be in power anomaly and performing the process(thread) thereof, information of the local storage capacity of thesub-processor detected to be power anomaly, described in thesub-processor program transfer request command, and informationregarding the operation states of the sub-processor 43-1 through thesub-processor 43-8 of own apparatus stored in the power management table373. The power anomaly correction controller 392 generates the powerinformation reply command, and controls the power management informationtransmission and reception controller 391 to transmit the generatedpower information reply command. Processing returns to step S461 torepeat step S461 and subsequent steps.

If it is determined in step S464 that an abnormal value is contained inthe power information, the power rise detector 355 notifies, in stepS467, the interrupt controller 352 of the detection of the abnormalpower consumption rise, thereby causing the interrupt controller 352 tointerrupt the arithmetic processor 161 and the power anomaly correctioncontroller 392. The interrupt controller 352 interrupts the arithmeticprocessor 161 and the power anomaly correction controller 392, therebystopping the process of the application program controlled by thearithmetic processor 161 and causing the power anomaly correctioncontroller 392 to start an anomaly-time process 7.

The anomaly-time process 7 to be discussed later with reference to FIG.50 is executed in step S468.

In step S469, the interrupt controller 352 controls the logical threadmanagement processor 357 based on the anomaly-time process 7 executed instep S368, thereby updating the table of the logical thread managementas necessary.

In step S470, the interrupt controller 352 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S461 to repeat step S461and subsequent steps.

Regardless of whether each information processing apparatus 301connected to the network 2 is a master apparatus or a slave apparatus, apower anomaly of own apparatus is detected based on the power managementtable updated based on the power information detected by own powermeasurement unit 321. In the event of the anomaly, the interrupt processis performed and the anomaly-time process 7 to be discussed later isperformed. If the sub-processor program transfer request command isreceived from the other information processing apparatus 301 connectedto the network 2, a sub-processor program transfer reply command isgenerated, and then transmitted to the requesting information processingapparatus 301.

The anomaly-time process 7 executed in step S468 of FIG. 49 is describedbelow with reference to a flowchart of FIG. 50.

In step S481, the power anomaly correction controller 392 references thepower management table 373 to generate the sub-processor programtransfer request command. The power anomaly correction controller 392controls the power management information transmission and receptioncontroller 391 to transmit the generated command to all otherinformation processing apparatuses 301 connected to the network 2. Thepower management information transmission and reception controller 391transmits, via the communication unit 16 and the network 2, thegenerated command to all other information processing apparatuses 301connected to the network 2.

In step S482, the power management information transmission andreception controller 391 receives the sub-processor program transferreply command and supplies the power anomaly correction controller 392with the sub-processor program transfer reply command.

In step S483, the power anomaly correction controller 392 determines,based on the sub-processor program transfer reply command received instep S482, whether the process of the sub-processor 43 detected to be inpower anomaly is transferable.

If it is determined in step S483 that the process is transferable, aprocess basically identical to that performed in steps S434 through S437of FIG. 47 is performed in steps S484 through S487. More specifically,the power management table 373 is referenced, an information processingcontroller 311 is selected as transfer target from among the informationprocessing controllers 111 in the information processing apparatuses 301connected to the network 2, the context of the process being executed bythe sub-processor 43 of the information processing controller 311detected to consume power above the power consumption upper limit isevacuated, the operation of the sub-processor 43 of the informationprocessing controller 311 detected to consume power above the powerconsumption upper limit is stopped, and the evacuated context isrestored back to the target sub-processor 43 of the informationprocessing controller 311 as the transfer target.

Subsequent to step S487, processing returns to step S468 and proceeds tostep S469 of FIG. 49.

If it is determined in step S483 that the process is not transferable, aprocess basically identical to that performed in steps S438 through S443of FIG. 47 is performed in steps S488 through S493. More specifically,the power management table 373 is referenced, a information processingcontroller 311 is selected as an interchange target from among theinformation processing controllers 311 in the information processingapparatuses 301 connected to the network 2, the context of the processexecuted by the information processing controller 311 detected toconsume power above the power consumption upper limit is evacuated, andthe operation of the sub-processor 43 of the information processingcontroller 311 detected to consume power above the power consumptionupper limit is stopped.

The context of the process being executed by the sub-processor 43 of theinformation processing controller 311 selected as the interchange targetis evacuated, the operation of the sub-processor 43 of the informationprocessing controller 311 selected as the interchange target is stopped,and the contexts of the two sub-processors 43 are interchanged forrestoration.

Subsequent to step S493, processing returns to step S468 and proceeds tostep S469 of FIG. 49.

In this way, if the information processing controller 311 is detected tobe power anomaly, the sub-processor program transfer request command istransmitted, and the reply command is received. Based on the replycommand, the transfer target or the interchange target of the process isselected.

In accordance with the third embodiment of the present invention, theplurality of information processing apparatuses 301 connected to thenetwork 2, each having the information processing controller 311 withthe power measurement unit 321, perform the process as discussed withreference to FIGS. 48-50. With the third pattern control of thetemperature information and the transfer or interchange of the process,device failure or lowered processing speed due to heat is preventedwhile the suspension of the process in the middle thereof is minimized.

An information processing apparatus 395, including a plurality ofinformation processing controllers 311-1 through 311-p (p is a positiveinteger) as shown in FIG. 51, transmits and receive, via the bus 14, avariety of pieces of information, as in the second embodiment where thevariety of pieces of information is transmitted and received by theplurality of information processing controllers 111 via thecommunication unit 16 and the network 2. The present invention is alsoapplicable to such an arrangement.

One of the information processing controllers 311-1 through 311-p in theinformation processing apparatus 395 functions as a master controller inthe information processing apparatus 395, and the other informationprocessing controllers 311 function as slave controllers. Each of thefirst through third patterns of the third embodiment is equallyapplicable. A power anomaly is detected in any of the informationprocessing controllers 311-1 through 311-p. In this way, whether tosuspend the process, whether to transfer part of the distributedprocessing, or whether to interchange part of the distributed processingis determined depending on the operation of the information processingcontrollers 311 connected to the bus 14 and the temperature measurementresults of the processors. One of the transfer target and theinterchange target is thus selected.

Information processing apparatuses 395-1 and 395-2, each having the samestructure as the information processing apparatus 395 discussed withreference to FIG. 51, can be connected to the network 2 as shown in FIG.52. The plurality of information processing apparatuses 301 (such as theinformation processing apparatuses 301-1 and 301-2 as shown in FIG. 52)can also be connected to the network 2. A power anomaly may be detectedin any of the information processing controllers 311-1 through 311-p inthe information processing apparatus 395-1, and neither transfer targetnor interchange target may be found in each of the informationprocessing controllers 311 connected to the bus 14. In such a case, oneof the first through third patterns of the third embodiment is used. Atransfer target or an interchange target may be selected from theinformation processing apparatus 395-2 and the information processingcontroller 311 contained in the plurality of information processingapparatuses 301, each apparatus connected to via the connected to thenetwork 2. If the other conditions are the same, a higher priority maybe placed in the selection of the transfer target or the interchangetarget on the other information processing apparatus 395-2 or the otherinformation processing apparatus 301 operating from the AC power sourcethan those operating from the rechargeable battery power or the drybattery power.

The information processing controller of one embodiment of the presentinvention can be implemented as a one-chip integrated circuit containinga plurality of sub-processors. A temperature detector using atemperature sensor can be arranged at each of the main processor and thesub-processor. Using the temperature detector, the main processor andthe sub-processor are controlled to operate within a normal operatingtemperature range. Power consumed by the information processingcontroller is also monitored so that a single information processingcontroller may not consume an excessive amount of power. With thisarrangement, device degradation is controlled, and highly reliableinformation processing controller and information processing apparatusare provided. In the information processing controller in accordancewith one embodiment of the present invention, a process is transferredor interchanged between sub-processors of at least one informationprocessing apparatus in response to a temperature rise or an increase inpower consumption. Device failure and lowered processing speed due toheat are thus prevented.

An information processing controller of an information processingapparatus of one embodiment of the present invention is described belowwith reference to FIGS. 53 through 60. The information processingcontroller of the embodiment performs distributed processing in responseto a temperature rise and an increase in power consumption ofprocessors.

FIG. 53 is a block diagram of an information processing apparatus 401-1.The information processing apparatus 401-1 includes temperaturedetectors 121-1 through 121-m measuring temperature of sub-processors43-1 through 43-m and a power measurement unit 321 measuring powerconsumed by the information processing controller 411. The informationprocessing controller 411 monitors the state of a power supply 19. Theinformation processing controller 411 includes a temperature and powermanagement processor 421.

As shown in FIG. 53, elements identical to those described withreference to FIG. 1 are designated with the same reference numerals, andthe discussion thereof is omitted herein as appropriate. The informationprocessing apparatus 401-1 of FIG. 53 includes the informationprocessing controller 411 in place of the information processingcontroller 11 of FIG. 1. The information processing controller 411includes the temperature detectors 121-1 through 121-m measuringtemperatures of the sub-processors 43-1 through 43-m, a temperaturedetector 121-(m+1) measuring temperature of the main processor 42, andthe temperature and power management processor 421 monitoring the sateof the power supply 19 and acquiring measurement results of the powermeasurement unit 321. The power measurement unit 321 measures powerconsumed by the one-chip information processing controller 411. The restof the information processing controller 411 remains unchanged from theinformation processing apparatus 1 discussed with reference to FIG. 1.

The information processing apparatuses 401-2 through 401-n connected tothe network 2 are similar to the information processing apparatus 401-1in structure, and the discussion of the structure thereof is thusomitted herein. If it is not necessary to discriminate one from anotheramong the information processing apparatuses 401-1 through 401-n, eachinformation processing apparatus is simply referred to as 401.

FIG. 54 illustrates the structure of a software program executed by theinformation processing controller 411. The information processingcontroller 411 controls distributed processing assignment in response toa temperature rise and/or an increase in power consumption. The softwareprogram is pre-recorded on the recorder 13 connected to the informationprocessing controller 411 prior to the power on of the informationprocessing apparatus 401.

As shown in FIG. 54, elements identical to those described withreference to FIG. 8 are designated with the same reference numerals, andthe discussion thereof is omitted herein. The structure of the softwareprogram stored in the main memory 12 of the information processingcontroller 411 in accordance with the embodiment of the presentinvention is substantially identical to the software structure discussedwith reference to FIG. 8 except that a temperature and power managementprogram is contained as a control program. The temperature and powermanagement program is preferably a resident program that is continuouslyoperative while the main power of the information processing apparatus401 remains turned on.

Under the control of the temperature and power management program, theinformation processing controller 411 gathers information relating totemperatures measured by the temperature detectors 121-1 through121-(m+2), and information relating to power measured by the powermeasurement unit 321. Based on the temperature information and the powerinformation, the information processing controller 411 controls theprocess of the main processor 42, and as necessary, the transfer orinterchange of the process of the sub-processors 43-1 through 43-m. Theinformation processing controller 411 exchange temperature and powerinformation with other information processing apparatuses 401 via thenetwork 2, and then controls the process executed by the main processor42, and the transfer or interchange of the process executed by thesub-processors 43-1 through 43-m as necessary.

The control of the temperature information and the power information andthe transfer or interchange of the process of the information processingapparatuses 401 connected to the network 2 is performed in the followingthree patterns.

In a first pattern, the information processing apparatus 401-1, ifidentified as a master apparatus, manages own temperature and powermanagement table but also temperature and power management tables of theinformation processing apparatus 401-2 through the informationprocessing apparatus 401-n as slave apparatuses. More specifically, eachof the information processing apparatus 401-2 through the informationprocessing apparatus 401-n, as the slave apparatuses, regularlytransmits an updated temperature and power management table thereof tothe information processing apparatus 401-1. The information processingapparatus 401-1 as the master apparatus monitors the temperature andpower information of all information processing apparatuses 401-1through 401-n, and if an abnormal temperature rise or an abnormal powerconsumption is detected in any of the information processing apparatuses401-1 through 401-n, the information processing apparatus 401-1 selectsan appropriate sub-processor 43 as a transfer target or an interchangetarget of the process from among all sub-processors 43 contained in theinformation processing controllers 411 of the information processingapparatuses 401 connected to the network 2. The information processingapparatus 401-1 performs control process to transfer the process of thesub-processor 43 detected to be in anomaly to the selected sub-processor43 or to interchange the processes between the two sub-processors 43.

In a second pattern, the information processing apparatus 401 monitorsown temperature management table, and if an abnormal power consumptionis detected in the power management table, the information processingapparatus 401 transmits, to all other information processing apparatuses401, a command requesting all other information processing apparatuses401 to transmit the temperature and power information. Morespecifically, upon receiving a command requesting the transmission ofthe temperature and power information, an information processingapparatus 401 detecting neither abnormal temperature rise nor abnormalpower consumption generates a power information reply command, andtransmits the command to reply the generated temperature and powerinformation to the information processing apparatus 401 as the source ofthe power information request command.

The temperature and power information reply command contains informationrelating to the updated temperature detection results of the heat sink141, the main processor 42, and the sub-processors 43-1 through 43-8(the updated temperature detection results of the temperature detectors121-1 through 121-10), the set temperature upper limits of the heat sink141, the main processor 42, and the sub-processors 43-1 through 43-8(namely, if temperature detected by each of the temperature detectors121-1 through 121-10 becomes above the respective temperature upperlimit, a temperature anomaly is determined to take place), operationstate of the sub-processors 43-1 through 43-8, layout information of thesub-processors in the chip, information relating to the powerconsumption upper limit of AC power, the power consumption upper limitof rechargeable battery power, and the power consumption upper limit ofdry battery power, power connection information representing which of ACpower, rechargeable battery power, and dry battery power is connected,and power consumption in a current process.

Upon receiving the temperature and power information rely command, theinformation processing apparatus 401 selects an appropriatesub-processor 43 as a transfer target or an interchange target of theprocess from among all sub-processors 43 contained in the informationprocessing controllers 111 of the information processing apparatuses 401connected to the network 2. The information processing apparatus 401performs control process to transfer the process of the sub-processor 43detected to be in anomaly to the selected sub-processor 43 or tointerchange the processes between the two sub-processors 43.

In a third pattern, each information processing apparatus 401 monitorsown power management table, and if an abnormal temperature rise orabnormal power consumption is detected in the temperature and powermanagement table, the information processing apparatus 401 transmits, toall other information processing apparatuses 401, a command requestingall other information processing apparatuses 401 to transfersub-processor programs. More specifically, upon receiving a commandrequesting the transfer of the sub-processor program from the otherinformation processing apparatus 401, an information processingapparatus 401 detecting neither abnormal temperature rise nor abnormalpower consumption generates, based on own temperature and powermanagement table, a reply command indicating whether own apparatus canbe a transfer target or an interchange target of the sub-processorprogram. The information processing apparatus 401 then transmits thereply command to the information processing apparatus 401 as the sourceof the command requesting the transfer of the sub-processor program.Upon receiving the temperature and power information rely command, theinformation processing apparatus 401 selects an appropriatesub-processor 43 as a transfer target or an interchange target of theprocess from all sub-processors 43 contained in the informationprocessing controllers 411 of the information processing apparatuses 401connected to the network 2. The information processing apparatus 401performs control process to transfer the process of the sub-processor 43detected to be in anomaly to the selected sub-processor 43 or tointerchange the processes between the two sub-processors 43.

Particularly, if a temperature rise takes place in the three controlpatterns, a-sub-processor 43 contained in own apparatus can be selectedas a transfer target or an interchange target of the process withpriority.

FIG. 55 is a functional block diagram of the information processingcontroller 411 that performs the control process in the first pattern inaccordance with one embodiment of the present invention. The informationprocessing controller 411 controls distributed processing in response toa temperature rise or an increase in power consumption. Elementsidentical to those described with reference to FIG. 21 are designatedwith the same reference numerals, and the discussion thereof is omittedas appropriate. In the first pattern of the information processingcontroller 411 as shown in FIG. 55, the main processor 42 includes ananomaly correction controller 455, a logical thread management processor457, and a temperature and power management information transmission andreception controller 456 in place of the temperature anomaly correctioncontroller 216, the logical thread management processor 217, and thetemperature management information transmission and reception controller214. The rest of the information processing controller 42 remainsunchanged from the main processor 42 of FIG. 21. A temperature and powermanagement processor 421, in place of the temperature monitoringprocessor 122 of FIG. 21, includes a temperature and power informationacquisition unit 451, an interrupt controller 165, a timer 166, atemperature and power management table 452, and an anomaly detector 453.

The temperature and power information acquisition unit 451 acquirestemperature information and power information from the temperaturedetector 121 and the power measurement unit 321 at timing controlled bythe interrupt controller 165, thereby updating a temperature and powermanagement table 452. The interrupt controller 165 references the timer166 and timer-interrupts the temperature and power informationacquisition unit 451. In response to information supplied from theanomaly detector 453, the interrupt controller 165 interrupts thearithmetic processor 161 and the anomaly correction controller 455.

Under the control of the anomaly correction controller 455, thetemperature and power management information transmission and receptioncontroller 456 controls transmitting, via the communication unit 16, thetemperature and power management table or a variety of commands(software cell) generated for temperature and power management to theother information processing apparatuses 401 connected to the network 2.The temperature and power management information transmission andreception controller 456 controls receiving, via the communication unit16, the temperature and power management table of the other informationprocessing apparatuses 401 or a variety of commands (software cell)generated for power and temperature management from the otherinformation processing apparatuses 401 connected to the network 2. Thetemperature and power management table or the variety of commands(software cell) generated for temperature and power management arecollectively referred to as temperature and power management informationif there is no need for discriminating information relating totemperature and power management of the plurality of informationprocessing apparatuses 401 connected to the network 2 and informationrelating to the control of distributed processing executed based on thetemperature and power management.

The temperature and power management table 452 holds information of theinformation processing controller 411 for managing temperature and powerconsumption. If own apparatus is a slave apparatus, the temperature andpower management table 452 holds own temperature an power information,and if own apparatus is a master apparatus, the temperature and powermanagement table 452 holds temperature and power information of allinformation processing apparatuses 401 connected to the network 2. Aspreviously discussed with reference to FIG. 13, the temperatureinformation contains a controller ID identifying the informationprocessing controller 411, information of the operation state of each ofthe sub-processors 43-1 through 43-8, information relating to theupdated temperature detection results of the heat sink 141, the mainprocessor 42, and the sub-processors 43-1 through 43-8 (the updatedtemperature detection results of the temperature detectors 121-1 through121-10), the set temperature upper limits of the heat sink 141, the mainprocessor 42, and the sub-processors 43-1 through 43-8 (namely, iftemperature detected by each of the temperature detectors 121-1 through121-10 becomes above the respective temperature upper limit, atemperature anomaly is determined to take place), and the layoutinformation of the sub-processors in the chip. As previously discussedwith reference to FIG. 40, the power information contains the controllerIDs of the information processing controllers 411, and informationrelating to the power consumption upper limit of AC power, the powerconsumption upper limit of rechargeable battery power, and the powerconsumption upper limit of dry battery power, power connectioninformation representing which of AC power, rechargeable battery power,and dry battery power is connected, and the power consumption in acurrent process.

The temperature upper limit is a specification value at the design stageof the information processing controller 411 and the informationprocessing apparatus 401, and is an upper temperature limit of arequired temperature range within which the normal operation of theinformation processing controller 411 and the information processingapparatus 401 is guaranteed. The temperature upper limit may be apreferred temperature upper limit below which a normal and efficientoperation of the information processing controller 411 and theinformation processing apparatus 401 is performed. The information ofthe operation status of the sub-processor 43-1 through the sub-processor43-8 indicates a run status or a stop status as to whether the apparatusis active or not. The sub-processor layout information indicates thelayout of the sub-processor 43-1 through the sub-processor 43-8 setbeforehand in the design stage of the information processing controller411 and the information processing apparatus 401.

The power consumption upper limit is determined at design stage of theinformation processing apparatus and is an upper limit below which theinformation processing apparatus 401 normally operates from the ACpower. The AC power consumption upper limit may be a preferable powerconsumption upper limit below which the information processing apparatus401 operates normally and efficiently. The same is true of the powerconsumption upper limits of the rechargeable battery power 73 and thedry battery power. The power connection information may be set at thedesign stage of the information processing apparatus 401. If theinformation processing apparatus 401 works with a plurality of powersources, the power connection information may be modified. The currentpower consumption is the one measured by the power measurement unit 321,and varies depending on the operation state of the informationprocessing apparatus 401.

If own apparatus is a master apparatus, the anomaly detector 453references the temperature and power management table 452. If a powerconsumption value above the predetermined upper limit is found in powerdetection results of all information processing apparatuses 401connected to the network 2, the anomaly detector 453 notifies theinterrupt controller 165 of the detection of the temperature anomaly orpower consumption anomaly, thereby causing the interrupt controller 165to interrupt the arithmetic processor 161 and the anomaly correctioncontroller 455.

If own apparatus is a master apparatus, the anomaly correctioncontroller 455 references the temperature and power management table 452in response to an interrupt from the interrupt controller 165. Theanomaly correction controller 455 thus detects which of the informationprocessing apparatuses 401 connected to the network 2 is in temperatureanomaly or power consumption anomaly. Based on the detection results,the anomaly correction controller 455 controls the logical threadmanagement processor 457, thereby stopping the process or transferringthe process of the information processing apparatus 401 detected intemperature anomaly or power consumption anomaly to another informationprocessing apparatus 401 or interchanging the processes between the twoinformation processing apparatuses 401.

The logical thread management processor 457 generates or deletes alogical thread of an application program performed by the arithmeticprocessor 161. If own apparatus is a master apparatus, the logicalthread management processor 457 monitors the state of the logical threadin distributed processing performed by one of the information processingapparatuses 401 connected to the network 2 and controls the distributedprocessing. If own apparatus is a master apparatus, the logical threadmanagement processor 457 generates a table listing managementinformation of all information processing apparatuses 401 connected tothe network 2 and a table listing information required to execute thelogical thread on a per executed logical thread basis. The logicalthread management processor 457 thus controls the execution of thelogical thread by referencing and updating the information of thetables.

If own apparatus is a master apparatus, the logical thread managementprocessor 457 generates a software cell controlling the process of thethread executed by another information processing apparatus 401 asnecessary, and transmits the generated software cell via thecommunication unit 16. If own apparatus is a slave apparatus, thelogical thread management processor 457 receives, via the communicationunit 16, a software cell transmitted from a master informationprocessing apparatus 401. The logical thread management processor 457causes the sub-processor 43 to perform the distributed processingresponsive to the software cell, generates a software cell correspondingto a reply or a response, and transmits the generated software cell viathe communication unit 16. Regardless whether own apparatus 401 is amaster apparatus or a slave apparatus, the logical thread managementprocessor 457 acquires, via the communication unit 16, informationrelating to a thread executed by another information processingapparatus 401.

Hardware performing the above function may be different from theabove-referenced structure of FIG. 55. For example, part of the functionof the main processor 42 may be carried out by the temperature and powermanagement processor 421, part of the function of the temperature andpower management processor 421 may be performed by the main processor42, or these functions may be performed by different hardware. Even insuch a case, the present invention is perfectly applicable.

The first pattern operation of the distributed processing is describedbelow with reference to flowcharts of FIGS. 56 through 60.

An application program execution process 3 executed by the informationprocessing apparatus 401 of FIG. 55 is described below with reference tothe flowchart of FIG. 56. The temperature and power management programis a resident program that is continuously operative while the mainpower of the information processing apparatus 401 remains turned on.

In step S451, the arithmetic processor 161 determines whether a user hasinput a command to execute an application program. More specifically, instep S451, the main processor 42 determines, in response to a signalsupplied from the operation input unit 15 via the bus 14 and the bus 41,whether the command to execute the application program has been issued.If it is determined in step S451 that the command to execute theapplication program has not been issued, the process of S451 is repeateduntil it is determined that the command to execute the applicationprogram has been issued.

If it is determined in step S451 that the command to execute theapplication program has been issued, the arithmetic processor 161 setsthe assignment of the logical thread to the sub-processors and suppliesthe setting information of the logical thread to the logical threadmanagement processor 457 in step S452.

In step S453, the logical thread management processor 457 loads aprogram and data for executing the assigned process to the code area 187and the data area 188 of the local storage 51 in the sub-processor 43 towhich the logical thread is assigned.

In step S454, the arithmetic processor 161 and the logical threadmanagement processor 457 control the execution of the applicationprogram including the process of the sub-processor 43. The arithmeticprocessor 181 in the sub-processor 43 performs the assigned process.

The temperature and power management program is a resident program thatis continuously operative while the main power of the informationprocessing apparatus 401 remains turned on, and the process is performedthroughout a period while steps S451 through S454 are executed. Thetemperature and power information management process of the masterapparatus will be described later with reference to the flowchart ofFIG. 57, and the temperature and power information management process ofthe slave apparatus will be described later with reference to theflowchart of FIG. 60.

In step S455, the arithmetic processor 161 determines whether aninterrupt responsive to the occurrence of a temperature anomaly or poweranomaly is issued from the interrupt controller 165. If it is determinedin step S455 that an interrupt responsive to the occurrence of a poweranomaly is not issued, processing proceeds to step S458.

If it is determined in step S455 that an interrupt responsive to theoccurrence of a temperature anomaly or a power anomaly is issued, thecurrent process is suspended.

In step S456, the arithmetic processor 161 determines whether theinterrupt is released. If it is determined in step S456 that theinterrupt is not yet released, the process at step S456 is repeateduntil it is determined that the interrupt has been released.

If it is determined in step S456 that the interrupt has been released,the arithmetic processor 161 supplies the logical thread managementprocessor 457 with the setting information of the logical thread againas necessary. The logical thread management processor 457 thus updatesthe table relating to the logical thread management.

If it is determined in step S455 that the interrupt responsive to theoccurrence of a temperature anomaly or a power consumption anomaly hasnot been issued, the arithmetic processor 161 determines in step S458subsequent to the end of step S457 whether the process of theapplication program has been completed. If it is determined in step S458that the process of the application program has not been completed,processing returns to step S454 to repeat step S454 and subsequentsteps. If it is determined in step S458 that the process of theapplication program has been completed, processing ends.

The selected sub-processor 43 performs the distributed processingcorresponding to the application program performed by the main processor42.

A temperature and power information management process of the masterapparatus is described below with reference to the flowchart of FIG. 57.

In step S471, the temperature and power information acquisition unit 451determines whether a timer interrupt has been issued from the interruptcontroller 165.

If it is determined in step S471 that no timer interrupt has beenissued, the temperature and power management information transmissionand reception controller 456 determines in step S472 whether atemperature and power management table has been received from any of theinformation processing apparatuses 401 connected to the network 2. If itis determined in step S472 that no temperature and power managementtable has been received, processing returns to step S471 to repeat stepS471 and subsequent steps. If it is determined in step S472 that atemperature and power management table has been received, processingproceeds to step S474.

If it is determined in step S471 that a timer interrupt has beenreceived, the temperature and power information acquisition unit 451acquires power measurement results from each power measurement unit 321and temperature management results from the temperature detector 121 instep S473.

If it is determined in step S472 that a temperature and power managementtable has been received, or subsequent to step S473, the temperature andpower information acquisition unit 451 updates, in step S474, thetemperature and power management table 452 based on the temperature andpower management table of the other information processing apparatus 401received in step S472, or own temperature and power information acquiredin step S473.

In step S475, the anomaly detector 453 references the temperature andpower management table 452 to determine whether an abnormal value iscontained in the temperature and power information, in other words,whether any of the power detection results detected by the powermeasurement units 321 or temperature detection results detected by thetemperature detectors 121 arranged in the information processingapparatuses 401 connected to the network 2 is above the predeterminedtemperature upper limit or power consumption upper limit. If it isdetermined in step S475 that no abnormal value is contained in thetemperature and power information, processing returns to step S471 torepeat step S471 and subsequent steps.

If it is determined in step S475 that an abnormal value is contained inthe temperature and power information, the anomaly detector 453 notifiesthe interrupt controller 165 of the detection of an abnormal temperaturerise or an abnormal power consumption in step S476, thereby causing theinterrupt controller 165 to interrupt the arithmetic processor 161 andthe anomaly correction controller 455. The interrupt controller 165interrupts the arithmetic processor 161 and the anomaly correctioncontroller 455, thereby causing the arithmetic processor 161 to stop theprocess of the application program and the anomaly correction controller455 to start an anomaly-time process 8.

The anomaly-time process 8 to be discussed later with reference to FIGS.58 and 59 is performed in step S477.

In step S478, the anomaly correction controller 455 controls the logicalthread management processor 457 in accordance with the anomaly-timeprocess 8 executed in step S477, thereby causing the logical threadmanagement processor 557 to update a table for thread management asnecessary.

In step S479, the interrupt controller 165 releases the interrupt to theprocess of the application program controlled by the arithmeticprocessor 161, and processing returns to step S471 to repeat step S471and subsequent steps.

The master information processing apparatus 401 acquires the temperatureand power management table updated based on the power detection resultsdetected by the power measurement unit 321 and the temperature detectionresults detected by the temperature detector 121 arranged in each of theinformation processing apparatuses 401 connected to the network 2, andmanages the table as the temperature and power management table 452.Whether to perform an anomaly-time interrupt process is thus determinedbased on the temperature and power management table 452 stored in themaster information processing apparatus 401.

The anomaly-time process 8 executed in step S447 of FIG. 57 is describedbelow with reference to flowcharts of FIGS. 58 and 59.

In step S501, the anomaly correction controller 455 references thetemperature and power management table 452 to determine a temperatureanomaly takes place. If it is determined in step S501 that notemperature anomaly takes place, processing proceeds to step S519.

If it is determined in step S501 that a temperature anomaly takes place,the anomaly correction controller 455 references the temperature andpower management table 452, and determines which of the main processor42 and the information processing controller 411 suffers from thetemperature anomaly in step S502, in other words, which of thetemperature detector 121-9 and the temperature detector 121-10 hasdetected temperatures above the predetermined temperature upper limit.If it is determined in step S502 that one of the main processor 42 andthe information processing controller 411 causes the temperatureanomaly, processing proceeds to step S514 as described below.

If it is determined in step S502 that neither the main processor 42 northe information processing controller 411 causes the temperatureanomaly, in other words, that any of the sub-processors 43 has causedthe temperature anomaly, the anomaly correction controller 455references the temperature and power management table 452 in step S503.In step S503, the anomaly correction controller 455 thus determineswhether the process of the sub-processor 43 detected to be intemperature anomaly is transferable, in other words, whether any ofsub-processors 43 other than the sub-processor 43 detected to be intemperature anomaly is not currently operating. If it is determined instep S503 that the process of the sub-processor 43 detected to be intemperature anomaly is not transferable, processing proceeds to stepS508.

If it is determined in step S503 that the process of the sub-processor43 detected to be in temperature anomaly is transferable, the anomalycorrection controller 455 selects a sub-processor 43 as a transfertarget of the process, and notifies the logical thread managementprocessor 457 of the selection results in step S504. More specifically,the anomaly correction controller 455 selects, as a transfer target withpriority, one sub-processor 43 resulting in the lowest temperaturemeasurement from among those that have remained inoperative and are notclosely located to the currently operating sub-processor 43, out of thesub-processors 43 in the information processing controllers 411 of theinformation processing apparatuses 401 connected to the network 2. If aplurality of sub-processors 43 satisfy the criteria, the anomalycorrection controller 455 selects a sub-processor 43 having the smallestsub-processor ID number as a transfer target. If sub-processors 43 thathave remained inoperative and are located far from the currentlyoperating sub-processor 43 are not available, one resulting in thelowest temperature measurement is selected from among the currentlyinoperative sub-processors 43. If a plurality of sub-processors 43satisfy the criteria, a sub-processor 43 having the smallestsub-processor ID number is selected as a transfer target. The anomalycorrection controller 455 then notifies the logical thread managementprocessor 457 of the selection results.

In step S505, the logical thread management processor 457 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit. If the sub-processor 43 abovethe temperature upper limit is in a master apparatus, the interruptcontroller 185 of the sub-processor 43 detected to be above thetemperature upper limit suspends the process of the arithmetic processor181 in response to an interrupt command to evacuate the currentlyprocessed context. The thread transfer and interchange processor 186evacuates the context of the currently executed program (the values ofthe register 182, the floating-point register 183, and the programcounter 184) to the stack area 190. If the sub-processor 43 in thetransfer target pre-stores the commonly used program and model data, thethread transfer and interchange processor 186 transfers the content ofthe stack area 190 and the data area 189 to an information storage areamanaged by the logical thread management processor 457 (a portion of thestorage area of the local storage 51 of the main processor 42). If thesub-processor 43 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area managed by the logical thread management processor 163 (theportion of the storage area of the local storage 51 of the mainprocessor 42).

If the sub-processor 43 detected to be above the temperature upper limitis in a slave apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 in the transfer target pre-stores thecommonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 457 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 401 functioning as a master apparatus via the bus41, the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area managed by the logical thread management processor 457 (theportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 101 functioning asthe master apparatus via the bus 41, the bus 14, the communication unit16 and the network 2.

In step S506, the logical thread management processor 457 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S507, the logical thread management processor 457 restores thecontext, evacuated in step S505, to the sub-processor 43 selected as thetransfer target sub-processor. More specifically, if the transfer targetsub-processor 43 is the one in the master apparatus, the logical threadmanagement processor 457 supplies the context stored in an informationstorage area managed by itself to the transfer target sub-processor 43via the bus 41. If the transfer target sub-processor 43 is the one inthe slave apparatus, the logical thread management processor 457supplies the context stored in the information storage area manageditself to the transfer target sub-processor 43 contained in theinformation processing apparatus 401 functioning as the slave apparatus,via the bus 41, the bus 14, the communication unit 16 and the network 2.The sub-processor 43 selected as the transfer target sub-processorstores the supplied context in the code area 187 through the stack area190 thereof. Processing proceeds to step S519.

If it is determined in step S503 that the process of the sub-processor43 detected to be in temperature anomaly is not transferable, theanomaly correction controller 455 selects a sub-processor 43 as aninterchange target and notifies the logical thread management processor457 of the selection results in step S508. More specifically, theanomaly correction controller 455 selects, as an interchange targetsub-processor 43 with priority, one resulting in the lowest temperaturemeasurement from among the sub-processors 43 of the informationprocessing controllers 411 of the information processing apparatuses 401connected to the network 2. If a plurality of sub-processors 43 satisfythe criteria, the anomaly correction controller 455 selects asub-processor 43 having the smallest sub-processor ID number as aninterchange target.

In step S509, the logical thread management processor 457 evacuates thecontext of the process being executed by the sub-processor 43 detectedto be above the temperature upper limit. If the sub-processor 43detected to be above the temperature upper limit is in a masterapparatus, the interrupt controller 185 stops the process of thearithmetic processor 181 in response to an interrupt command instructingthe evacuation of the context of the current process. The threadtransfer and interchange processor 186 evacuates the context of thecurrently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 in the interchange target pre-storesthe commonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 457 (a portion of the storage areaof the local storage 51 of the main processor 42). If the sub-processor43 does not pre-store commonly used program and model data, the threadtransfer and interchange processor 186 transfers the data of the codearea 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 457 (the portion ofthe storage area of the local storage 51 of the main processor 42).

If the sub-processor 43 detected to be above the temperature upper limitis in a slave apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 in the interchange target pre-storesthe commonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 457 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 401 functioning as a master apparatus via the bus41, the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 does not pre-store commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thedata of the code area 187 through the stack area 190 to the informationstorage area managed by the logical thread management processor 457 (theportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 401 functioning asthe master apparatus via the bus 41, the bus 14, the communication unit16 and the network 2.

In step S510, the logical thread management processor 457 stops theoperation of the sub-processor 43 detected to be above the temperatureupper limit.

In step S511, the logical thread management processor 457 evacuates thecontext of the process executed by the sub-processor 43 selected as theinterchange target. If the sub-processor 43 selected as the interchangetarget is in a master apparatus, the interrupt controller 185 suspendsthe process of the arithmetic processor 181 in response to an interruptcommand to evacuate the currently processed context. The thread transferand interchange processor 186 evacuates the context of the currentlyexecuted program (the values of the register 182, the floating-pointregister 183, and the program counter 184) to the stack area 190. If thesub-processor 43 in an interchange source pre-stores the commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the content of the stack area 190 and the data area 189 toan information storage area managed by the logical thread managementprocessor 457 (a portion of the storage area of the local storage 51 ofthe main processor 42). If the sub-processor 43 in the interchangesource does not pre-store commonly used program and model data, thethread transfer and interchange processor 186 transfers the data of thecode area 187 through the stack area 190 to the information storage areamanaged by the logical thread management processor 457 (the portion ofthe storage area of the local storage 51 of the main processor 42).

If the sub-processor 43 detected to be above the temperature upper limitis in a slave apparatus, the interrupt controller 185 stops the processof the arithmetic processor 181 in response to an interrupt commandinstructing the evacuation of the context of the current process. Thethread transfer and interchange processor 186 evacuates the context ofthe currently running program (the values of the register 182, thefloating-point register 183, and the program counter 184) to the stackarea 190. If the sub-processor 43 in the interchange source pre-storesthe commonly used program and model data, the thread transfer andinterchange processor 186 transfers the content of the stack area 190and the data area 189 to an information storage area managed by thelogical thread management processor 457 (a portion of the storage areaof the local storage 51 of the main processor 42) in the informationprocessing apparatus 101 operating as a master apparatus via the bus 41,the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 in the interchange source does not pre-store commonlyused program and model data, the thread transfer and interchangeprocessor 186 transfers the data of the code area 187 through the stackarea 190 to the information storage area managed by the logical threadmanagement processor 457 (the portion of the storage area of the localstorage 51 of the main processor 42) in the information processingapparatus 401 operating as the master apparatus via the bus 41, the bus14, the communication unit 16 and the network 2.

In step S512, the logical thread management processor 457 stops theoperation of the sub-processor 43 selected as the interchange target.

In step S513, the logical thread management processor 457 interchangescontexts between the two context-evacuated sub-processors 43 to restorethe context there. More specifically, the logical thread managementprocessor 457 restores the context, evacuated in step S509, to thesub-processor 43 selected as the interchange target of the process whilerestoring the context, evacuated in step S511, to the sub-processor 43detected to be above the temperature upper limit. If the sub-processor43 detected to be above the temperature upper limit or the interchangetarget sub-processor 43 is the one in the master apparatus, the logicalthread management processor 457 supplies the corresponding contextstored in the information storage area managed by itself to theinterchange target sub-processor 43 via the bus 41. If the sub-processor43 detected to be above the temperature upper limit or the interchangetarget sub-processor 43 is the one in the slave apparatus, the logicalthread management processor 457 supplies the corresponding contextstored in the information storage area managed by itself to the targetsub-processor 43 detected to be above the temperature upper limit or theinterchange target sub-processor 43 contained in the informationprocessing apparatus 401 operating as the slave apparatus via the bus41, the bus 14, the communication unit 16 and the network 2. Eachsub-processor 43 stores the supplied context in areas of the code area187 through the stack area 190 thereof. Processing proceeds to stepS519.

If it is determined in step S502 that one of the main processor 42 andthe information processing controller 411 suffers from the temperatureanomaly, the anomaly correction controller 455 determines in step S514whether one of the main processor 42 and the information processingcontroller 411 suffering from the temperature anomaly is contained inthe information processing apparatus 401 as the master apparatus. If itis determined in step S514 that one of the main processor 42 and theinformation processing controller 411 suffering from the temperatureanomaly is contained in the information processing apparatus 401 as themaster apparatus, processing proceeds to step S517.

If it is determined in step S514 that one of the main processor 42 andthe information processing controller 411 suffering from the temperatureanomaly is not contained in the information processing apparatus 401 asthe master apparatus, in other words, one of the main processor 42 andthe information processing controller 411 suffering from the temperatureanomaly is contained in the information processing apparatus 401 as thesalve apparatus, the anomaly correction controller 455 references thetemperature and power management table 452 in step S515. In step S515,the anomaly correction controller 455 thus determines whether theprocess of the one of the main processor 42 and the informationprocessing controller 411 in the information processing apparatus 401 istransferable. If it is determined in step S515 that the process of theone of the main processor 42 and the information processing controller411 in the information processing apparatus 401 is transferable,processing proceeds to step S504.

If it is determined in step S515 that the process of the one of the mainprocessor 42 and the information processing controller 411 in theinformation processing apparatus 401 is not transferable, the anomalycorrection controller 455 references the temperature and powermanagement table 452 in step S516. In step S516, the anomaly correctioncontroller 455 determines the process of the one of the main processor42 and the information processing controller 411 in the informationprocessing apparatus 401 is interchangeable. If it is determined in stepS516 that the process of the one of the main processor 42 and theinformation processing controller 411 in the information processingapparatus 401 is interchangeable, processing proceeds to step S508.

If it is determined in step S514 that the one of the main processor 42and the information processing controller 411, detected to be intemperature anomaly, is contained in the information processingapparatus 401 as the master apparatus, or if it is determined in stepS516 that the process of one of the main processor 42 and theinformation processing controller 411 in the information processingapparatus 401 is not interchangeable, the anomaly correction controller455 controls, in step S517, the logical thread management processor 457to temporarily stop the application program executed by the arithmeticprocessor 161. The process of the main processor 42, except part thereofexecuted by the resident program, is temporarily suspended.

In step S518, the anomaly correction controller 455 references thetemperature and power management table 452 to determine normaltemperature state is restored. If it is determined in step S518 thatnormal temperature state is not yet restored, the process in step S518is repeated until the normal temperature state is restored.

If it is determined in step S501 that no temperature anomaly takesplace, or subsequent to step S507, or subsequent to step S513, or if itis determined in step S518 that the normal temperature state isrestored, the anomaly correction controller 455 determines in step S519whether a power anomaly takes place. If it is determined in step S519that no power anomaly takes place, processing returns to step S477 andthen proceeds to step S478 as shown in FIG. 57.

If it is determined in step S519 that a power anomaly takes place, theanomaly correction controller 455 references the temperature and powermanagement table 452 in step S520 to determine whether the process ofall sub-processors 43 contained the information processing controller411 detected to be in power consumption anomaly is transferable. If itis determined in step S520 that the process of all sub-processors 43 inthe information processing controller 411 detected to be powerconsumption anomaly is not transferable, processing proceeds to stepS525.

If it is determined in step S520 that the process of all sub-processors43 contained in the information processing controller 411 detected to bein power consumption anomaly is transferable, the anomaly correctioncontroller 455 references the temperature and power management table 452in step S521. In step S521, the anomaly correction controller 455 thusselects an information processing controller 411 as a transfer target ofthe process from among the information processing controllers 411 of theinformation processing apparatuses 101 connected to the network 2, andnotifies the logical thread management processor 457 of the selectionresults. More specifically, the anomaly correction controller 455references the temperature and power management table 452 and selects,as a transfer target with priority, one information processingcontroller 411 consuming the lowest power from those that are enabled toperform the process of the currently operating sub-processor 43 and arenot closely located to the currently operating information processingcontroller 411, from among the information processing controllers 411 ofthe information processing apparatuses 401 connected to the network 2.Alternatively, the anomaly correction controller 455 may select, as atransfer target with higher priority, the information processingcontroller 411 in the information processing apparatus 401 operatingfrom the AC power source than the information processing controller 411in the information processing apparatus 401 operating from therechargeable battery power or the dry battery power. If a plurality ofinformation processing controllers 411 satisfy the criteria, the anomalycorrection controller 455 selects an information processing controller411 having the smallest processor ID number as a transfer target.

In the information processing controller 411 selected as the transfertarget, the logical thread management processor 457 in the mainprocessor 42 determines which sub-processors 43 to assign thedistributed processing to.

In step S522, the logical thread management processor 457 evacuates thecontext of the process executed by the information processing controller411 detected to consume power above the power consumption upper limit.

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a master apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the transfer target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 457 (aportion of the storage area of the local storage 51 of the mainprocessor 42). If the sub-processor 43 does not pre-store commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the data of the code area 187 through the stack area 190to the information storage area managed by the logical thread managementprocessor 457 (the portion of the storage area of the local storage 51of the main processor 42).

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a slave apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the transfer target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 457 (aportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 401 functioning asa master apparatus via the bus 41, the bus 14, the communication unit 16and the network 2. If the sub-processor 43 does not pre-store commonlyused program and model data, the thread transfer and interchangeprocessor 186 transfers the data of the code area 187 through the stackarea 190 to the information storage area managed by the logical threadmanagement processor 457 (the portion of the storage area of the localstorage 51 of the main processor 42) in the information processingapparatus 401 operating as the master apparatus via the bus 41, the bus14, the communication unit 16 and the network 2.

In step S523, the logical thread management processor 457 stops theoperation of the sub-processor 43 in the information processingcontroller 411 detected to consume power above the power consumptionupper limit.

In step S524, the logical thread management processor 457 restores thecontext, evacuated in step S522, to the sub-processor 43 in theinformation processing controller 411 selected as the transfer target.More specifically, if the transfer target sub-processor 43 is the one inthe master apparatus, the logical thread management processor 457supplies the context stored in an information storage area managed byitself to the transfer target sub-processor 43 via the bus 41. If thetransfer target sub-processor 43 is the one in the slave apparatus, thelogical thread management processor 457 supplies the context stored inthe information storage area managed itself to the transfer targetsub-processor 43 contained in the information processing apparatus 401functioning as a slave apparatus, via the bus 41, the bus 14, thecommunication unit 16 and the network 2. In the sub-processor 43selected as the transfer target, the supplied context is stored in areascorresponding to the code area 187 through the stack area 190, andprocessing returns to step S477 and then proceeds to step S478 of FIG.57.

If it is determined in step S520 that the process of all sub-processors43 contained in the information processing controller 411 detected to bein power consumption anomaly is not transferable, the anomaly correctioncontroller 455 references the temperature and power management table 452in step S525. In step S525, the anomaly correction controller 455 thusselects a sub-processor 43 as an interchange target of the process fromamong the sub-processors 43 of the information processing controllers411 of the information processing apparatuses 101 connected to thenetwork 2, and notifies the logical thread management processor 457 ofthe selection results. More specifically, the anomaly correctioncontroller 455 selects, as an interchange target with priority, oneinformation processing controller 411 consuming the lowest power fromamong the information processing controllers 411 of the informationprocessing apparatuses 401 connected to the network 2. Alternatively,the anomaly correction controller 455 may select, as an interchangetarget with higher priority, the information processing controller 411in the information processing apparatus 401 operating from the AC powersource than the information processing controller 411 in the informationprocessing apparatus 401 operating from the rechargeable battery poweror the dry battery power. If a plurality of information processingcontrollers 411 satisfy the criteria, the anomaly correction controller455 selects an information processing controller 411 having the smallestprocessor ID number as an interchange target.

If the commonly used program and model data required to execute theprocess are supplied beforehand to the local storages 51 of onesub-processors 43 having no distributed processing assignment, theinformation processing controller 411 having that sub-processor 43 withthat local storage 51 may be selected with priority.

In the information processing controller 411 selected as the interchangetarget, the logical thread management processor 457 in the mainprocessor 42 determines which of the sub-processors 43 is assigned thedistributed processing.

In step S526, the logical thread management processor 457 evacuates thecontext of the process being executed by the sub-processor 43 of theinformation processing controller 411 detected to consume power abovethe power consumption upper limit.

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a master apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange target pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 457 (aportion of the storage area of the local storage 51 of the mainprocessor 42). If the sub-processor 43 does not pre-store commonly usedprogram and model data, the thread transfer and interchange processor186 transfers the data of the code area 187 through the stack area 190to the information storage area managed by the logical thread managementprocessor 457 (the portion of the storage area of the local storage 51of the main processor 42).

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a slave apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange process pre-stores the commonly used program andmodel data, the thread transfer and interchange processor 186 transfersthe content of the stack area 190 and the data area 189 to aninformation storage area managed by the logical thread managementprocessor 457 (a portion of the storage area of the local storage 51 ofthe main processor 42) in the information processing apparatus 401operating as a master apparatus via the bus 41, the bus 14, thecommunication unit 16 and the network 2. If the sub-processor 43 doesnot pre-store commonly used program and model data, the thread transferand interchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 457 (the portion of the storagearea of the local storage 51 of the main processor 42) in theinformation processing apparatus 401 operating as the master apparatusvia the bus 41, the bus 14, the communication unit 16 and the network 2.

In step S527, the logical thread management processor 457 stops theoperation of the sub-processor 43 in the information processingcontroller 411 detected to consume power above the power consumptionupper limit.

In step S528, the logical thread management processor 457 restores thecontext of the process being executed by the sub-processor 43 of theinformation processing controller 411 selected as the interchangetarget.

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a master apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in an interchange source pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 457 (aportion of the storage area of the local storage 51 of the mainprocessor 42). If the sub-processor 43 in the interchange source doesnot pre-store commonly used program and model data, the thread transferand interchange processor 186 transfers the data of the code area 187through the stack area 190 to the information storage area managed bythe logical thread management processor 457 (the portion of the storagearea of the local storage 51 of the main processor 42).

If the information processing controller 411 detected to consume powerabove the power consumption upper limit is in a slave apparatus, theinterrupt controller 185 stops the process of the arithmetic processor181 in response to an interrupt command instructing the evacuation ofthe context of the current process. The thread transfer and interchangeprocessor 186 evacuates the context of the currently running program(the values of the register 182, the floating-point register 183, andthe program counter 184) to the stack area 190. If the sub-processor 43in the interchange source pre-stores the commonly used program and modeldata, the thread transfer and interchange processor 186 transfers thecontent of the stack area 190 and the data area 189 to an informationstorage area managed by the logical thread management processor 457 (aportion of the storage area of the local storage 51 of the mainprocessor 42) in the information processing apparatus 401 via the bus41, the bus 14, the communication unit 16 and the network 2. If thesub-processor 43 in the interchange source does not pre-store commonlyused program and model data, the thread transfer and interchangeprocessor 186 transfers the data of the code area 187 through the stackarea 190 to the information storage area managed by the logical threadmanagement processor 457 (the portion of the storage area of the localstorage 51 of the main processor 42) in the information processingapparatus 401 via the bus 41, the bus 14, the communication unit 16 andthe network 2.

In step S529, the logical thread management processor 457 stops theoperation of the sub-processor 43 in the information processingcontroller 411 selected as the interchange target.

In step S530, for context restoration, the logical thread managementprocessor 457 interchanges the contexts of the sub-processors 43 in thetwo information processing controllers 411 that have undergone contextevacuation. More specifically, the logical thread management processor457 restores the context, evacuated in step S526, to the sub-processor43 in the information processing controller 411 selected as theinterchange target while restoring the context, evacuated in step S528,to the sub-processor 43 in the information processing controller 411that has consumed power above the power consumption upper limit. Inother words, if the information processing controller 411 detected toconsume power above the power consumption upper limit or the interchangetarget information processing controller 411 is the one in the masterapparatus, the logical thread management processor 457 supplies thecorresponding context stored in the information storage area managed byitself to the interchange target sub-processor 43 via the bus 41. If theinformation processing controller 411 detected to consume power abovethe power consumption upper limit or the interchange target informationprocessing controller 411 is the one in the slave apparatus, the logicalthread management processor 457 supplies the corresponding contextstored in the information storage area managed by itself to theinformation processing controller 411 detected to consume power abovethe power consumption upper limit or the interchange targetsub-processor 43 contained in the information processing apparatus 401operating as the slave apparatus via the bus 41, the bus 14, thecommunication unit 16 and the network 2. The sub-processor 43 in eachinformation processing controller 411 stores the supplied context inareas of the code area 187 through the stack area 190. Processingreturns to step S477 and then proceeds to step S478 as shown in FIG. 57.

In this way, whether to transfer part of the distributed processing, orwhether to interchange part of the distributed processing is determineddepending on the location of the power anomaly, the operation of eachinformation processing controller 411 of the information processingapparatuses 401 connected to the network 2, and the temperaturemeasurement values and the power measurement values of the processors.One of the transfer target and the interchange target is alsodetermined.

A temperature and power information management process of the slaveapparatus executed in parallel with the power information managementprocess of the master apparatus discussed with reference to FIG. 57 isdescribed below with reference to the flowchart of FIG. 60.

In step S561, the temperature and power information acquisition unit 451in the information processing apparatus 401 functioning as a slaveapparatus determines whether a timer interrupt has been input from theinterrupt controller 165. If it is determined in step S561 that no timerinterrupt has been input, the process in step S561 is repeated until itis determined that a timer interrupt has been input.

If it is determined in step S561 that a timer interrupt has been input,the power temperature and power information acquisition unit 451acquires the temperature and power information from the temperaturedetector 121 and the power measurement unit 321, respectively, in stepS562.

In step S563, the temperature and power information acquisition unit 451updates the temperature and power management table 452 based on thetemperature information and the power information acquired in step S562.

In step S564, the temperature and power management informationtransmission and reception controller 456 transmits the power managementtable 354, updated in step S563, to the information processing apparatus401 functioning as the master apparatus via the communication unit 16and the network 2. Processing returns to step S561 to repeat step S561and subsequent steps.

The temperature and power management table of the slave apparatus istransmitted to the master apparatus in this way. The transmittedtemperature and power management table of the slave apparatus is thenmanaged by the master apparatus.

The plurality of information processing apparatuses 401 connected to thenetwork 2, each including the power measurement unit 321 arranged tomeasure power consumption of the information processing controller 411and the temperature detector 121 arranged to measure temperatures of theinformation processing controller 411, perform the process as discussedwith reference to FIGS. 56-60. With the first pattern control of thetemperature and power information and the transfer or interchange of theprocess, device failure or lowered processing speed due to heat isprevented while the suspension of the process in the middle thereof isminimized.

The first pattern control of the distributed processing responsive tothe temperature information and the power information has beendiscussed. The distributed processing can be performed in one of thesecond pattern and the third pattern using the temperature informationor the power information. For example, the distributed processing iscontrolled based on the temperature information and the powerinformation by exchanging the temperature and power informationtransmission command the temperature and power information reply commandor by exchanging the sub-processor program transfer request command andthe sub-processor program transfer reply command. Thus, device failureor lowered processing speed due to heat is prevented while thesuspension of the process in the middle thereof is minimized.

The present invention is also applicable to the system of FIG. 53 wherethe plurality of information processing controllers 411 are included,and the system of FIG. 53 where the plurality of information processingcontrollers 411 is connected to the network 2.

The above-references series of steps can be performed in software. Aprogram forming the software is installed from a recording medium onto acomputer incorporated into a hardware structure. The software programmay be installed from the recording medium to a general-purposecomputer, for example.

As shown in FIG. 1, users may be supplied with the software program inthe recording medium separate from a computer. As shown in FIG. 1, therecording media include package media including the magnetic disk 61(such the Floppy Disk®), the optical disk 62 (such as a compact diskread-only memory (CD-ROM), and a digital versatile disk (DVD)), themagneto-optic disk 63 (such as Mini-Disk (MD®)), and the semiconductormemory 64.

The process steps discussed in this specification are sequentiallyperformed in the time series order as stated. Alternatively, the stepsmay be performed in parallel or separately.

In this specification, the system refers to a system composed of aplurality of apparatuses.

It should be understood by those skilled in the art that variousmodifications, combinations, sub-combinations and alterations may occurdepending on design requirements and other factors insofar as they arewithin the scope of the appended claims or the equivalents thereof.

1. An information processing apparatus, comprising: first informationprocessing means; a plurality of second information processing means;power measurement means for measuring power consumed by an informationprocessing module including the first information processing means andthe plurality of second information processing means; and communicationmeans for communicating with the other information processing apparatus,wherein the first information processing means comprises: an applicationprogram execution control unit for controlling execution of anapplication program; a distributed processing control unit forcontrolling distributed processing that performs process assignment onthe plurality of second information processing means in order to providea function corresponding to a process unit, the application programexecution control unit, when executing the application program, forminga plurality of processes to be respectively assigned to the plurality ofsecond information processing means, into the process unit for providingthe function; a recording unit for recording first information relatingto power measured by the power measurement means, and second informationrelating to the execution of the process of the plurality of secondinformation processing means; an anomaly detecting unit for detecting ananomaly in the power consumption measured by the power measurementmeans; and an anomaly-time control unit for controlling the distributedprocessing of the distributed processing control unit in response to thepower anomaly detected by the anomaly detecting unit, wherein theanomaly-time control unit controls the distributed processing controlunit to update, based on the first information and the secondinformation recorded by the recording unit, the assignment of theprocess being executed by the plurality of second information processingmeans contained in the information processing module detected to be inpower anomaly.
 2. The information processing apparatus according toclaim 1, forming a network system together with at least anotherinformation processing apparatus communicable via the communicationmeans, if own information processing apparatus functions as a masterapparatus, wherein the communication means receives the firstinformation and the second information of the other informationprocessing apparatus from the other information processing apparatus,wherein the recording unit further records the first information and thesecond information of the other information processing apparatus,received by the communication means, wherein the anomaly detecting unitfurther detects a power anomaly generated in the other informationprocessing apparatus communicable via the communication means, based onthe first information of the other information processing apparatusrecorded by the recording unit, and wherein the anomaly-time controlunit controls the distributed processing control unit to update theassignment of the process being executed by the plurality of secondinformation processing means contained in the information processingmodule detected to be in power anomaly, based on the first informationand the second information of own information processing apparatus andthe other information processing apparatus, recorded by the recordingunit, if the anomaly detecting unit detects the power anomaly; and ifown information processing apparatus functions as a slave apparatus inthe network system, the communication means transmits the firstinformation and the second information, recorded by the recording unit,to a master apparatus in the network system.
 3. The informationprocessing apparatus according to claim 1, wherein the anomaly-timecontrol unit generates a first signal requesting the other informationprocessing apparatus communicable via the communication unit to transmitthe first information and the second information of the otherinformation processing apparatus if the anomaly detecting unit detectsthe power anomaly, wherein the communication means transmits the firstsignal to the other information processing apparatus while receiving,from the other information processing apparatus, a second signalcorresponding to the first information and the second information, andwherein the anomaly-time control unit controls the distributedprocessing control unit to update the assignment of the process beingexecuted by the plurality of second information processing meanscontained in the information processing module detected to be in poweranomaly, in response to the second signal received by the communicationmeans.
 4. The information processing apparatus according to claim 1,wherein the anomaly-time control unit generates a first signalrequesting the other information processing apparatus communicable viathe communication unit to execute the process being executed by theplurality of second information processing means detected to be in poweranomaly if the anomaly detecting unit detects the power anomaly, whereinthe communication means transmits the first signal to the otherinformation processing apparatus while receiving, from the otherinformation processing apparatus, a second signal in reply to the firstsignal, and wherein the anomaly-time control unit controls thedistributed processing control unit to update the assignment of theprocess being executed by the plurality of second information processingmeans contained in the information processing module detected to be inpower anomaly, in response to the second signal received by thecommunication means.
 5. The information processing apparatus accordingto claim 1, wherein the anomaly-time control unit controls thedistributed processing control unit to update the process assignment sothat one of the other image processing modules detected not to be inpower anomaly is selected, and so that the process being executed by theplurality of second information processing means contained in theinformation processing module detected in power anomaly is performed bythe plurality of second information processing means contained in theselected information processing module.
 6. The information processingapparatus according to claim 5, wherein the anomaly-time control unitselects, as a process assignment target with high priority, theinformation processing module consuming power which, as detected by theanomaly detecting unit, is lower than the power consumed by the otherinformation processing means.
 7. The information processing apparatusaccording to claim 5, wherein the anomaly-time control unit selects, asa process assignment target with higher priority, the informationprocessing module operating from an alternating current source than theinformation processing module operating from a battery power source. 8.The information processing apparatus according to claim 1, wherein theanomaly-time control unit controls the distributed processing controlunit to update the process assignment so that one of the secondinformation processing modules detected not to be in power anomaly isselected, and so that the process being executed by the plurality ofsecond information processing means in the information processing moduledetected to be in power anomaly is interchanged with the process of theplurality of second information processing means in the selectedinformation processing module in execution of the processes.
 9. Theinformation processing apparatus according to claim 8, wherein theanomaly-time control unit selects, as a process interchange target withhigh priority, the information processing module consuming power which,as detected by the anomaly detecting unit, is lower than the powerconsumed by the other information processing module.
 10. The informationprocessing apparatus according to claim 8, wherein the anomaly-timecontrol unit selects, as a process interchange target with higherpriority, the information processing module operating from analternating current source than the information processing moduleoperating from a battery power source.
 11. The information processingapparatus according to claim 1, further comprising a plurality ofinformation processing modules.
 12. An information processing method ofan information processing apparatus including first informationprocessing means, a plurality of second information processing means,and communication means for communicating with another informationprocessing apparatus, the information processing method comprising stepsof: requesting the start of distributed processing for providing afunction corresponding to a process unit, the first informationprocessing means, when executing an application program, forming aplurality of processes to be respectively assigned to the plurality ofsecond information processing means, into the process unit for providingthe function; acquiring information relating to power consumed by aninformation processing module including the first information processingmeans and the plurality of second information processing means;detecting an anomaly in the information relating to the powerconsumption acquired in the power information acquisition step; andcontrolling the distributed processing to update the assignment of theprocess being executed by the plurality of second information processingmeans in the information processing module detected to be in poweranomaly, based on the power information acquired in the powerinformation acquisition step.
 13. A computer program product comprisinga non-transitory computer readable medium including program code storedthereon, said program code being executable to perform operationscomprising: requesting the start of distributed processing for providinga function corresponding to a process unit, a first informationprocessing means, when executing an application program, forming aplurality of processes to be respectively assigned to a plurality ofsecond information processing means, into the process unit for providingthe function; acquiring information relating to power consumed by aninformation processing module including the first information processingmeans and the plurality of second information processing means;detecting an anomaly in the information relating to the powerconsumption acquired in the power information acquisition step; andcontrolling the distributed processing to update the assignment of theprocess executed by the plurality of second information processing meansin the information processing module detected to be in power anomaly,based on the power information acquired in the power informationacquisition step.
 14. An information processing apparatus, comprising: afirst information processor; a plurality of second informationprocessors; a power measurement unit measuring power consumed by aninformation processing module including the first information processorand the second information processor; and a communication unitcommunicating with the other information processing apparatus, whereinthe first information processor comprises: an application programexecution control unit controlling execution of an application program;a distributed processing control unit controlling distributed processingthat performs process assignment on the plurality of second informationprocessors in order to provide a function corresponding to a processunit, the application program execution control unit, when executing theapplication program, forming a plurality of processes to be respectivelyassigned to the plurality of second information processors, into theprocess unit for providing the function; a recording unit recordingfirst information relating to power measured by the power measurementunit, and second information relating to the execution of the process ofthe plurality of second information processors; an anomaly detectingunit detecting an anomaly in the power consumption measured by the powermeasurement unit; and an anomaly-time control unit controlling thedistributed processing of the distributed processing control unit inresponse to the power anomaly detected by the anomaly detecting unit,wherein the anomaly-time control unit controls the distributedprocessing control unit to update, based on the first information andthe second information recorded by the recording unit, the assignment ofthe process being executed by the plurality of second informationprocessors contained in the information processing module detected to bein power anomaly.